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Mobo and Robo Bonanza are enjoying their favorite television show when the picture crackles and a shadowy figure of a mysterious stranger appears on screen. This figure asks them to collect certain items that he has placed inside various buildings to test his security force. If they return the items successfully, Mobo and Robo will be rewarded. The two of them state that they will get the job done in just three minutes. However, little do they know that each building is packed with security guards who will raise the alarm if they are caught red-handed. Fortunately both Mobo and Robo are equipped with bullets that can knock the guards unconscious for a few seconds. An $100 reward will be given out if Mobo and Robo are apprehended.

As either Mobo or Robo, you must collect all the treasures before leaving the ten buildings and shoot any security guards that get in your way. Remember that you are under a time limit. An in-game map will help you locate the treasures. There is a bonus stage after three buildings, where the object is to collect the gold bars in a limited amount of time without one of the three spotlights shining on you. If it is possible, hide behind open doors. If you manage to get all the gold bars, 10,000 points is added to your score. There are three of these bonus stages, but each of them varies.


Bonanza Bros. SEGA Master System Stage 2: Mansion
Bonanza Bros. SEGA Master System A guard gets squashed by a 256t weight
Bonanza Bros. SEGA Master System High Scores
Bonanza Bros. SEGA Master System Stage 5: Department Store

Promo Images

Bonanza Bros. Screenshot
Bonanza Bros. Screenshot
Bonanza Bros. Screenshot
Bonanza Bros. Screenshot

Alternate Titles

  • "Bonanza Brothers " -- US Genesis title
  • "ボナンザ ブラザーズ" -- Japanese spelling

Part of the Following Group

User Reviews

There are no reviews for the SEGA Master System release of this game. You can use the links below to write your own review or read reviews for the other platforms of this game.

Critic Reviews

Ação Games Feb, 1992 4 Stars4 Stars4 Stars4 Stars 100
Play Time Jan, 1992 77 out of 100 77
Sega Pro (UK) Apr, 1992 75 out of 100 75
Video Games Feb, 1992 62 out of 100 62


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Katakis | カタキス (39781) added Bonanza Bros. (SEGA Master System) on Mar 14, 2004
Other platforms contributed by Corn Popper (69350), chirinea (44806), FatherJack (62754), Foxhack (24870), Kabushi (214897), Martin Smith (66864), Terok Nor (27129) and Katakis | カタキス (39781)