[[caption-width-right:200:[[SignatureLaugh Eh heh heh!]]]]
''Bonanza Bros.'' is a PlatformGame by Creator/{{Sega}}, released in 1990. In an interesting twist, instead of trying to stop criminals, [[VillainProtagonist the player characters ''are'' criminals]].

The premise of the game is simple. Each stage begins with the robbers, named Robo and Mobo (or Mike and Spike in some of the international versions), looking at a projector screen. Once getting an overview of their target, they break in and rob the place blind. However, each building is armed with security officers ready to arrest them. If they are caught, or take too long, the brothers are sent up the river.

The game premiered as an arcade game, but was later ported to other consoles. The UsefulNotes/MegaDrive version has been bundled in many compilations, as well as downloadable on the Virtual Console. Two spin-offs of the game were created, both labeled "Puzzle & Action". As their name suggests, they both were puzzle games.

The brothers made a surprise appearance in ''[[VideoGame/SegaSuperstars Sonic & Sega All-Stars Racing]]'', driving a black getaway car. The duo appear as statues in the game's sequel, ''Sonic & All Stars Racing Transformed''.

!! Tropes found in this game include
* AttackItsWeakPoint: The riot shield guards can only be shot in the back and side, or slammed with doors.
* BadassBoast: In the original Japanese flyers for the game, there's a quote from the brothers--
-->'''Robo and Mobo:''' We're going to capture all of your valuable treasures!! Here we go, you gang of clowns!!
* BagOfSpilling: Whenever Mobo or Robo lose a life, they'll drop all the treasures that they were carrying around the spot where they got hit, meaning that they'll have to return to where it happened in order to get their stuff back.
* BashBrothers: Although they tend to assist in stealth more than fighting, in Co-Op, expect the Bros. to be doing double damage.
* {{Bowdlerise}}: Outside Japan, the Bros. are not currently criminals, but retired. The police chief of Badville, a city plagued with high crime, hires the brothers to help him based on their experience. Their job is to test his security forces, as well as recover evidence.
** As of ''[[VideoGame/SegaSuperstars Sonic & Sega All-Stars Racing]]'', this has been retconned, so now they are internationally considered [[VillainProtagonist Villain Protagonists]].
* TheCasino: The third level.
* ColorCodedMultiplayer: Robo's red, Mobo's blue.
* ContinuityNod: The duo's bio in ''All-Stars Racing'' says they like solving puzzles, referring to the Puzzle & Action games.
* CoolAirship: Mobo and Robo's getaway vehicle of choice in their robberies. After they've got all the evidence/goods they need to collect, they have to get up onto the roof of the building, where the airship will be waiting to pick them up.
* TheDoorSlamsYou: An easy way to stop a guard...or for a guard to stop you.
* DubInducedPlothole: In the international version, the boys are still sent to prison when they get a Game Over, even though here, they're helping the police recover evidence. However, it may have something to do with their status as retired criminals in this version-- not having to serve their sentences if they succeed, and vice versa.
* DubNameChange: The brothers are known as Mike and Spike in some international versions. Later retconned in ''[[VideoGame/SegaSuperstars Sonic & Sega All-Stars Racing]]'', where they're referred to by their original names.
* EvilLaugh: Whenever they get some treasure. Doubles as a SignatureLaugh--
-->''"Eh heh heh!"''
* FamilyFriendlyFirearms: The duo's signature weapons are handguns that don't ''kill'' anyone, but can effectively knock any targets they hit out-cold for a little while.
* FatAndSkinny: In external materials, Mobo and Robo are often depicted this way. Robo's taller and thinner, whilst Mobo is shorter and fatter.
* GiantMook: The large, purple-clad guards.
* IdleAnimation: Both brothers have a few: Impatiently staring at the screen, sprucing themselves with a mirror, or swatting flies.
* MeaningfulName: The city of Badville, the crime-infested city where the game takes place. The Ultimate Genesis Collection description of the game even [[LampshadeHanging points out]] the unfortunate name.
* OneHitPointWonder: Robo and Mobo can only take a single hit.
* PrecisionFStrike: On the front covers of some of the home versions, you get this bit of dialogue from the brothers. Nothing too major for today's standards, but back then--
-->''"I'm Mobo. Who the hell are you?"''
-->''"I'm Robo. Who the hell are '''you?'''"''
* RetiredBadass: In the international versions of the game, Mobo and Robo are both retired former criminals, who have been brought out of retirement by the Police Chief of Badville in order to put their experience as burglars to good use.
* ScarfOfAssKicking: In all versions of the game, Mobo and Robo both wear snazzy white scarves.
* SunglassesAtNight: Even in the night-time stages, the duo both wear fancy sunglasses. It's lampshaded in one of the flyers for the U.S. Gold home conversions of the game--
-->Ask them why they wear dark glasses, and they'll tell you; ''"Our future's so bright, we've gotta wear shades!"''
* VillainsOutShopping: [[http://www.atarimania.com/st/boxes/hi_res/bonanza_bros_us_gold_d7_2.jpg Some of the posters]] for the game depict the boys doing various things outside of their usual burglary-- including attending a football game, watching TV, playing golf, riding skateboards, and reading newspapers.
* {{Villain Protagonist}}s: As seen in their original Japanese backstory and the ''VideoGame/SegaSuperstars'' bio, Robo and Mobo are professional burglars. Averted in the U.S. versions, where they're reformed villains who are hired by the Badville Chief of Police to recover evidence from crime scenes and various crooked businesses and institutions.