[[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, 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 ''[[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 or slammed with doors.
* BashBrothers: Although they tend to assist in stealth more than fighting, in Co-Op, expect the Bros. to be doing double damage.
* 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!!
* {{Bowdlerise}}: Outside Japan, the Bros. are not criminals. The police chief of Badville, a city plagued with high crime, hires the brothers to help him. Their job is to test his security forces, as well as recover evidence.
** As of ''[[SegaSuperstars Sonic & Sega All-Stars Racing]]'', this has been retconned, so now they are internationally considered [[VillainProtagonist Villain Protagonists]].
* TheCasino: The third level.
* ContinuityNod: The duo's bio in ''All-Stars Racing'' says they like solving puzzles, referring to the Puzzle & Action games.
* ColorCodedMultiplayer: Robo's red, Mobo's blue.
* TheDoorSlamsYou: An easy way to stop a guard...or for a guard to stop you.
* DubInducedPlothole: In the U.S. version, the boys are still sent to prison when they get a Game Over, even though here, they're helping the police recover evidence.
* DubNameChange: The brothers are known as Mike and Spike in some international versions. Later retconned in ''[[SegaSuperstars Sonic & Sega All-Stars Racing]]'', where they're referred to by their original names.
* EvilLaugh: When 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.
* 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, where this 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.
* SunglassesAtNight: Even in the night-time stages, the duo both wear fancy sunglasses.
* {{Villain Protagonist}}s: As seen in their original Japanese backstory and the SegaSuperstars bio, Robo and Mobo are professional burglars. Averted in the U.S. versions, where they're hired to recover evidence from crime scenes and various crooked businesses and institutions.