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  • The North American version of the Nintendo Entertainment System used a proprietary (and patented) lockout chip called the 10NES, which reset the CPU if it did not detect a corresponding key chip on the game cartridge. Among other things, this allowed Nintendo to keep tight license control (and censorship) over developers attempting to publish games on the console, not just users attempting to make their own copies. This was at least in part because of the Atari 2600 and other consoles of the pre-NES era having no lockout controls whatsoever, leading to a market flooded with Shovelware, which was a major factor in The Great Video Game Crash of 1983; Nintendo was obviously keen on avoiding such a situation. Regardless, several companies discovered ways to beat the chip, such as piggybacking a chip from a licensed cartridge (Game Genie style) or using a voltage spike to knock out (bypass) the authentication circuit. Atari/Tengen (ironic, given their earlier role in necessitating such a system to begin with) notably obtained the specs of the chip by (falsely) claiming they needed it for evidence in a legal case of their own, using that information to make a duplicate chip, their "Rabbit" chip. Nintendo promptly sued them in return, winning one of two counts of infringement, but later choosing to settle out of court.
    • The original Famicom had no lockout chip. Similar to what happened to Atari, third party developers flooded the market with low-quality games, and pundits feared a crash of the Japanese video game market similar to the American one. This situation was a factor in Nintendo implementing copy protection into both the American NES and the Famicom Disk System.
    • The big kicker is that variants of the 10NES were also used in Europe, and due to the NES' history in Europe there are two different versions of the NES over there, each with its own (incompatible) 10NES chip. And yes, many Europeans were angry at the fact.
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    • However, the top-loading NES-101 omitted the lockout chips entirely, meaning that theoretically, a game made for the NES-101 may or may not be playable on the original NES-001.
    • Similar chips were also used in the Super NES, although for the SNES it is likely that all regions use the same chip (the chip only assures that the cartridge was manufactured by Nintendo themselves, and has nothing to do with Region Coding — given that breaking (or filing) off a pair of tabs at the back of a North American SNES' cartridge slot is all it takes to get Japanese games running).
    • This also applies to the Nintendo 64. However, this time Nintendo went back to multiple chips, with three kinds deployed in NTSC regions (regardless of Japanese or North American releases) and two kinds deployed in PAL regions. for this setup, the other part of the chip was handled by the I/O chip itself on the N64 and knocking it out would potentially kill the entire system. Additionally, the game can query the IO chip to ensure that the correct CIC chip is present.
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  • The Famicom Disk System's copy protection mechanism relied on a conceptually similar principle: the disks, which are nothing more than a semi-custom variant of Mitsumi's Quick Disk diskette format, had the wordmark "NINTENDO" molded at the bottom part of the disk, with the I and second N activating a switch that authenticated the games. As with the Game Boy, bootleggers can easily get away with duplicating the molds, but instead resort to Paper Thin Disguises obfuscating the Nintendo name somewhat to "NINFENDO", "NINTEN", "NINJENDO", "INTEND" or any variation thereof, or even just "IN". Then again, it's just the matter of making the right indentations on the disk without the need to mold the Nintendo name or the aforementioned corruptions at all, making the protection scheme next to useless. In addition, third parties in Japan sold adapters for conventional Quick Disks to be converted to an FDS-compatible disk. (This was one of the many factors as to why Nintendo stuck with cartridges until the Nintendo GameCube.)
  • The Game Boy's anti-piracy protection system is an interesting example, being more of a passive system that relies more on their lawyers, akin to Sega's efforts on the Genesis, than on EarthBound-style failsafes meant to cruelly penalize those who pirated it. The Game Boy boot ROM (often erroneously referred to by gamers as the BIOS, despite being technically more of a secure boot loader of sorts) checks for the presence of the Nintendo logo on the cartridge ROM, and if it matches the one stored on the boot ROM, the game loads up. Pirates can get away with just ripping it off an existing game for their bootleg titles to run, but as the "Nintendo®" logo is a registered trademark, that would make them an easy target for litigation: copyright may not be easily enforceable in certain jurisdictions, but trademarks are, hence the motivation for the scheme. A workaround taking advantage of a flaw in the system exists, as the bootloader reads the logo twice: once to display it on the LCD screen (along with the iconic "ping" sound), and the other to check if the original logo is in the cartridge ROM at all, to which a proof of concept method of subverting it was submitted by Argonaut Software in a rather amusing way to get Nintendo's attention, which was a stark contrast to how the Big N infamously intimidated unlicensed developers during the NES days.
    • Needless to say, the dual-logo trick was eventually exploited by bootleg developers in Taiwan, presumably as a form of Plausible Deniability should they be sued for releasing a game without Nintendo's permission, in that no trademarks are visibly violated, but that would be moot once the ROM is disassembled and studied.
    • This has however been rendered pointless once the courts ruled in Accolade's favor in Sega v. Accolade, where Sega's trademark enforcement system was questioned as being monopolistic, and bypassing it by third parties on the grounds that it is for the purposes of lawful interoperability was ruled as fair use.
      • Sega's didn't actually include the logo in the cart. You just had to have the word SEGA in the right place in the rom, and write SEGA to the correct address during boot, neither of which the end user saw. While it did cause the message proclaiming the game was licensed to display, that message was not read from the cartridge itself. Causing the message inside the BIOS to display then became innocent infringement, which couldn't be prosecuted. Since the trademark protection didn't actually work, it was then legal to include your own code that writes SEGA to $A14000 and include the SEGA bytes at $100 in the rom for interoperability purposes.
      • Speaking of Sega, while the Mega Drive/Genesis did the same general thing the Sega Master System did (differently shaped cartridges/slots), they had also planned on a Nintendo-style lockout system...until Electronic Arts reverse-engineered the system and used it to "negotiate" with Sega, resulting in Sega dropping the lockout policy entirely (and explaining why EA Genesis cartridges looked so different); this ultimately worked out for Sega as they were able to attract developers fed-up with Nintendo's strict policies.
  • The Nintendo GameCube used a proprietary 8cm DVD based on the miniDVD. Both Gamecube and Wii discs use a slight variant of the DVD sector-level encoding, making it more or less a DVD-like optical disc format with Serial Numbers Filed Off. Contrary to popular belief, Nintendo optical discs aren't spun backwards, nor they are read outside-in. While they're mostly the same optical format as with conventional DVDs, the main difference lies in obfuscating data on the disc, the encryption method used (which also involves the burst cutting area) and the proprietary filesystem. Certain DVD-ROM drives manufactured by LG are able to read through the discs, but these are rare and thus not readily available, so methods such as using Wii homebrew tools are a more viable approach.
  • The Wii (as well as Wii Mode on the Wii U) will reject any Virtual Console games on an SD card that weren't installed through the console itself. So do the DSi and 3DS, and this also applies to native games and apps on the SD card. This is because each game downloaded is immediately stamped (and probably encrypted) with the ID of the console that downloaded the game. Simply taking your SD card and putting it into another Wii will not work because the new console won't honor the game if the ID is different (or simply can't decrypt the game because the encryption key's different). However, doing a console transfer somehow and then putting in the SD card will allow the games on the SD card to be played on the new console- at the expense of the game no longer being playable on the old one.
  • Game manuals for Nintendo 3DS games include a lovely bit of text: "Important! Read the Nintendo 3DS operations manual before setup or use of your system. This product contains technical protection measures. Use of an unauthorized device or any unauthorized technical modification to your Nintendo 3DS system, will render this game and/or system unplayable." Yes, Nintendo is putting it right there in the manual that if you attempt to modify your 3DS, they will attempt to brick it via firmware updates. The catch? At least one method of delivering these updates cannot be disabled, and (in theory, at least) all firmware updates must be accepted by the 3DS. It appeared to be an empty threat, considering the popularity of the 3DS for custom-built homebrew games and emulators; it's possible it simply meant that updates can brick the system if the firmware is modified.
  • Nintendo Switch:
    • In general, Nintendo takes console modification (as in custom firmware and the like) very seriously compared to past consoles. The Nintendo Switch will keep track of any game/app (as in apps displayed on the home menu similarly to the games) not installed via the eShop or not run from its official game card, even after the pirated game is deleted. Game Mods are usually fine unless they cause desyncs during online multiplayer, while modified save files may be safe or not depending on the game. Even something small like having a completely custom user icon will guarantee a ban, but having a custom system background theme is still fine. The ban flagging will start once the console is connected to the internet, which allows sending telemetry, including all the recorded abnormalities. Nintendo has tried to combat this by patching later console releases (though this was eventually defeated by modchips, but this method gatekeeps the less technical users). So, unless the user knows what they are doing and takes precautions while attempting this, a ban flag is guaranteed.
    • Nintendo Switch game cards have a unique identifier each to prevent game copying. While the copy itself is still playable, if Nintendo's telemetry discovers that one identifier is used by two users at the same time, both parties will have their Switches banned. This does not apply if the game card dump is done properly, as in without leaving this identifier intact, but see the above point about game piracy on the console.
    • As for what a ban will do to the affected console, generally all online game content (at least those that go through Nintendo's own servers) is blocked, as well as use of Nintendo Switch Online (if the user is subscribed) and Nintendo eShop. Though the banned console can still receive updates, there is not much the user can do online other than local play. Then again, if piracy is now wide open and the user is not the type that is too concerned about online content, they may modify the Switch as much as they wish without all that telemetry-dodging anymore.


  • Pirated copies of Ace Attorney Investigations 2 replace all dialogue with Borginian and all evidence descriptions with "XXXXXXXXX".
  • The Batman Returns NES game runs several checks at certain points to see if the Batman logo on the title screen or the Konami logo have been modified. If they fail, Batman will take double damage, all passwords will be invalid, and the window at the end of 3-1 won't open, making the stage unbeatable.
  • Bucky O'Hare for the NES has code that detects if the copyright code has been modified. If it's set off, everything in the game is a One-Hit Kill, in a game where you normally have a Life Meter. This same effect can be enabled on unmodified copies of the game if the password "HARD!" is entered on the title screen.
  • Chrono Trigger allows you to play until you first travel back in time, then if it detects you're playing a pirated copy, it sticks you in an eternal loop in the warp sequence. This is present in both the Super NES and Nintendo DS versions, and doubles as an semi-effective anti-cheat measure, as it also triggers when infinite HP/MP Game Genie or Pro Action Replay codes are present (users can sidestep the anti-cheat aspect by only activating the Game Genie or Action Replay after arriving at their desired time period, and disabling the cheat device temporarily before time travelling).
  • Devil Survivor 2 has an anti-piracy routine during the fight against Dubhe, who has Story-Driven Invulnerability, forcing you to run from it until a cutscene occurs that leaves it severely damaged and removes its invulnerability, leaving it to be weak to any type of attack except for Fire. Should the copy-protection flag get hit, the cutscene will still happen, but Dubhe will remain invulnerable and leave the fight unwinnable.
  • Even the original arcade version of Donkey Kong has this method. Simply, the game hangs when any barrel bursts if the "INTEND" part of "NINTENDO" has been modified. Donkey Kong Jr. also has a similar method, if the "NINTENDO" sprite on the title screen has been modified, then the game will then glitch to being impossible to actually play, since including many glitches that occur, one of them is that Donkey Kong Jr. cannot climb vines.
  • All three Donkey Kong Country games on the Super NES feature variants of this if a copy protection trigger is tripped on the cartridge. The first game simply shows a blue screen featuring a generic "copying is illegal" message, while the latter two display a message mentioning an irregularity in the game cartridge/warning that piracy is illegal using each sequel's respective Game Over screen.
  • The Game Boy Advance Dragon Ball video game trilogy known as Dragon Ball Z The Legacy Of Goku (and the spiritual sequel, Dragon Ball GT: Transformation) has its form of copy protection wherein a message pops up at a certain point saying "this game cannot be played on this hardware" and won't go away, should it detect that it isn't a legit copy (although there are rumours of some retail copies having this problem as well). The emulator VisualBoyAdvance used to have problems with this form of copy protection, which made playing the games on that emulator rather difficult. The problem: it checks for the Save Type Data and RTC. If the Save Type Data or RTC setting does not match the information concealed further into the cart, it will instantly declare that it is a "pirated cart". Since emulators allow one to change these settings, they would set to Auto, right? Auto either pulls the settings from the cart/ROM or from a database. If pulling from an outdated database or from the ROM, it will retrieve a false data, telling to use an invalid Save Type Data. A vba-over.ini can be used to automatically set the save type to the correct setting, ignoring the false data.
  • EarthBound (1994) memorably has a vast array of copy protection mechanisms of surprising intricacy, thoroughness, and cruelty, and it's for good reason that the game's antipiracy methods are considered among the most clever and the most fiendish of any game. For its first layer, it has a checksum that can detect whether the game was running from a copied cartridge or being booted from a cartridge-copying device note ; if the mechanism doesn't check out, the game throws up an antipiracy warning screen at the beginning and doesn't play any further. If the protection is cracked, a checksum mechanismnote  will detect the change, and the game spawns many more enemies than usual - some even in places they don't belong! - in an attempt to discourage further playing. This may seem normal to a pirate or illegitimate player unaware with how the game normally plays, and so they may try to struggle through the game in this state. This is where the system gets very smart. If the player perseveres through this or cracks this second layer, however, an even nastier surprise awaits: the game will freeze and severely glitch after the first part of the Final Boss fight against Giygas, right as Porky switches off the Devil's Machine... and when you reset, you'll find all your saves deleted! These copy protection schemes also trigger sometimes on legit cartridges, likely due to wear and tear over time. Although unrelated to copy protection, the same wear and tear can cause the game to run entirely in black and white as well.
    • The English NES prototype of its predecessor, eventually released as EarthBound Beginnings, has similar copy protection, but it's more mundane and far less cruel in its implementation. Instead of making the game impossible and scrubbing your save games at the end, it runs a checksum at certain points to test whether the game is pirated; if it is determined it is, it freezes the game and throws up a screen saying that the game is an unauthorized copy and will not continue. This measure was part of a major headache in getting the ROM to work properly when it was first discovered and dumped in 1998, and owners of the actual physical prototypes are understandably concerned that the condition of the prototypes may set it off anyway. This protection wasn't in the Japanese version, nor does it exist in MOTHER 1+2 which is built upon the prototype data.
  • Final Fantasy:
    • The NES version of Final Fantasy will freeze upon booting if the "PROGRAMMED BY NASIR" text in the game's opening credits is modified in any way.
    • Final Fantasy Crystal Chronicles: Ring of Fates detects pirated copies. This causes the game to end after a while, with a "Thank you for playing!!" message, which certainly confused many pirates. Why not have a "Stop playing this game now, you dirty pirate!" message? This game was allowed as a demo in many stores, and this same message would play in the demos. The method of the Copy Protection is that the game has around a 30-45% chance of a random check to see if the game is a proper game... each time you change rooms in the dungeons. The demos were only given a certain amount of game memory and that does not include the key to stop the Copy Protection from activating. This truly is a great AP due to the way it confused so many Pirates.
  • Ghost Trick makes all the text blank if you use a flashcart.
  • On certain emulators, Hamtaro: Ham-Ham Heartbreak will not go past the character-naming screen due to an onboard protection system. Even worse: this particular protection has been cracked previously, but updates to the emulators keeps breaking this crack and tripping the protection again.
  • If the Famicom version of Kid Dracula has its copyright code modified, all objects will be removed from play once the player reaches the second level, making it impossible to beat.
  • The Legend of Zelda:
    • If The Legend of Zelda: Ocarina of Time detects the CIC6105 security chip is missing, it's impossible to catch any fish at the fishing pond and Princess Zelda won't open the barred doors in Ganon's Castle, making it impossible to complete the game. Also, adult Zelda's hair is a giant pentagon in cutscenes for some reason.
    • The Legend of Zelda: Spirit Tracks has this when you get on the train if you're playing a pirated copy. The controls for it won't show up, so you'll end up crashing into another train over and over again in the tutorial section. This was later patched.
  • Mario & Luigi: Bowser's Inside Story locks up at the file select screen. That was quickly patched, though. It also has a couple of lesser known ones: The tutorial battle with Bowser will go on forever because Bowser won't attack and Toadsworth won't do a tutorial which is required to progress (even if you say no to his offer). A second one occurs with another tutorial battle with a Goombule which won't progress because Starlow won't do a tutorial.
  • Mega Man:
    • All kinds of unpleasant things can happen if Mega Man X thinks that it's running on a copier: the game may take away all your items and upgrades, you may instantaneously be taken back to the intro stage upon shooting or picking up items, the game will add random inputs on top of your inputs, the game might instantly kill you at random... the list goes on. Faulty programming on Capcom's part led to legitimate carts of the original Japanese version setting off these effects anyway, which was fixed in the 1.1 revision.
    • Mega Man Battle Network:
      • Operate Shooting Star, a remake of the first game, prevents you from editing your folder and initiates a battle with three Mettaurs, the weakest enemy in the game, with every single step you take while on the Internet.
      • Battle Network 4 has a glaring problem that ultimately makes the game essentially unplayable without serious perseverance or an emulator. During the WoodMan event, should the player jack in to the net and fight an enemy, the player will find the music still playing to a totally black screen. Waiting a couple minutes will reveal the game is not frozen, but rather running somewhere around 1 frame per 30 seconds, essentially making navigating the entirety of the net to reach WoodMan fundamentally impossible without a lot of patience. Regular battles will perform normally, and the game runs properly after the event is over, but the event will always trigger this effect because of one thing: the cartridge scans to see if it's being played on a standard Game Boy Advance and only the standard Game Boy Advance. If, at any point, you put the game in a Game Boy Advance SP or a Nintendo DS and turn it on, the game will flag the cartridge and cause the anti-piracy to activate. This is present both on the Red Sun and Blue Moon versions, but can only be triggered on the Red Sun version if a Blue Moon player swapped data with a Red Sun player as the WoodMan event is version exclusive until doing so. Thus, not only are Blue Moon players essentially screwed, but Red Sun players will be accidentally screwed by their own friends/their own cartridges when doing this.note 
      • If Battle Network 6 detects that the copy of the game is not legitimate, MegaMan will interrupt the game in a text box to say the game is defective and you should buy a real copy of the game, then refuse to continue any further as the text box cannot be exited.
  • Mr. Gimmick!: At the beginning of Stage 7, there is a small bug crawling on the wall above the gateway to the inside of the castle. When this bug is loaded into memory, the game silently runs a checksum routine to make sure that the code for the developer credits in the game's intro sequence has not been modified in any way. If the checksum fails, the game will lock up on a blank screen with the text "BLACK HOLE" (a direct Shout-Out to Atlantis no Nazo, one of Sunsoft's earliest Famicom games), making the Golden Ending impossible to achieve.
  • The NES version of Parodius will endlessly loop the first stage if the copyright code is modified. This can also occur on legitimate carts if faulty connection with the console causes a false positive.
  • Pokémon:
    • If Pokémon HeartGold and SoulSilver detects it's being played on a flash card or emulator, the game will freeze and the player's Poké Balls will spin forever at the start of a battle.
    • Communication between Pokémon Black and White games and their sequels involves an infrared beam... which is built into the Game Card itself. So using a flashcart means no (convenient) local trading/battling with other players.note  Official Nintendo-sponsored tournaments of the era also required entrants to scan their infrared upon entry, which means only official copies were allowed.
      • Same for Pokémon Bank application's Poké Transporter sub-app. It can only detect genuine copies of Black or White as well as Black 2 or White 2, as flashcards are undetectable by the system.
      • If a copy of Black or White as well as their sequels realizes it's a bootleg, the game plays as normal... save that Pokémon don't gain experience points.
    • In order to prevent duping and other tricks, Pokémon X and Y, if played as a digital download instead of using the physical SD card, will stamp the install with the ID of the system AND the ID of the card. If you copy the game install from the SD card to another one (say, a larger one), the game will start up normally, but will give an error stating that it will not load your previous save and that you have to start over.
  • The Professor Layton series has a tradition of using bonus material for their games. In order to ensure that you get the content, they include a password from a previous game that can be used in the oncoming one. The catch is that the password you get corresponds to your own game system, so if you're trying to get content with a password from a friend's game system or from a site, you won't get anything.
  • Hackers had a field day when it came to Shin Megami Tensei: Strange Journey. Any pirated copies of the game will erase any saved data upon restarting, as well as not including any random encounter enemies whatsoever. The "save data erasure" assumes that the game even saves correctly (notably, on a LOT of cards, the game automatically stops saving halfway and states "save failed", and then deletes the failed save data when you attempt to load it), which turned out to be the least of your issues when you realize that the "random encounters" are actually required to stand a remote chance of making it through one round of a boss battle (Tool Assisted Superplays notwithstanding).
  • At a certain point in StarTropics, you are instructed to enter a three digit codenote  to allow Sub-C to track down Dr. Jones. The game instructs you to submerge the letter that Dr. Jones gave you to find this code without clarifying that the "letter" in question is in fact one of the Feelies that came with the game. This aspect is simulated and digitized in the Wii Virtual Console port, but not in the versions included with the NES Classic Edition or a Nintendo Switch Online subscription since they don't come with digital manuals, although in the case of the NES Classic Edition, the code is provided in the the Start Up guide labeled as a "Startropics Tip," although it's in small black text, and may not be easily noticed.
  • Super Mario All-Stars has a message that displays when it detects an unlicensed copy (of course, emulators are able to bypass this easily). It also tells you to refer to your Nintendo game instruction booklet on the off-chance that your copy is actually legit.
  • Super Metroid also has an anti-piracy message that displays if the game realizes that it's being run on a copier. The game also silently deletes all save data if it's displayed. It is possible that an Action Replay device can trigger the message as well, though it can still happen without one if there are connection issues between the system and the cartridge.
  • Teenage Mutant Ninja Turtles III: The Manhattan Project reduces the damage the Turtles deal, doubles the damage they take, disables all Cheat Codes, and makes the Final Boss, Super Shredder, invincible if the copyright code is modified.
  • If the first Tiny Toon Adventures NES game detects that it's illegitimate, depending on the game's region, beating Fido at the end of 3-3 or Montana Max at the end of the game will make the game jump back to 1-1 instead of proceeding to 4-1/the ending.
  • If Yume Penguin Monogatari detects that the copyright information on the title screen has been modified, any food that Penta eats will instantly make him obese, resulting in it being much more difficult to clear stages under the required weight limit.