Blender Bros. is a 2002 platform game developed by Hudson Soft and published by Infogrames. The game was originally released for the Game Boy Advance, but a version for Windows was published by Piko Interactive in 2020. Gameplay In Blender Bros., Players take control of Blender, a robotic dog. The player must navigate through a series of worlds (levels), defeating all enemies and solving all puzzles they encounter. Each world has a different theme (grassy, oceanic, etc.). A level is divided into three main stages, followed by a boss. One world is available initially. Completing a world unlocks one or more other worlds which the player will then have to complete until the final world. Levels consist of platform navigation, puzzle solving, boss fighting (at the end of the level), and a driving sequence. The levels are nonlinear and focus on puzzle solving and dexterity rather than speed (though the levels are timed, and players can track their times for each level). One aspect of the levels is the ability to interact with the background. Most levels consist of two layers, a front and back area which players can periodically move between. When players are in the front area, enemies and switches (an aspect of the game's puzzle solving mechanic) can be seen in the back area, forewarning them about the next part of the level. If they have access to a cosmo ball (a red ball that Blender can throw to kill enemies or hit switches), they can throw it upward to hit objects in the back area, allowing them to eliminate enemies before having to encounter them. The game consists of seven worlds: Oasis, Diva, Earth, Shelltarl, Cosmo Heaven, Fo9, and Millitar. Oasis is the only world unlocked at first. Players also have access to Cosmo Heaven, but only as a hub at first. After completing Oasis, they unlock Diva and Shelltarl. After completing those, Earth and Fo9 are unlocked. Completing these unlocks Millitar. Upon completing Millitar, Cosmo Heaven is invaded by the Zooligans, turning it into the final world of the game. Shelltarl is the only world which does not follow the three-stage format of the other worlds, being a single long level. Throughout the game, players can collect Mini Bros. Mini Bros. are familiars that give them particular abilities. Nuckle, the Mini Bro. that players start out with, gives them extra range for their primary attack.