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Mario vs. DK 2: Cannon Kaos is an online game developed in Adobe Flash and published by Nintendo as a tie-in with Mario vs. Donkey Kong 2: March of the Minis, first released in 2006 for the Nintendo DS. It was playable on the game's official website, and also the Nintendo Arcade section of nintendo.com.
The game plays in a similar fashion to the boss battles of Mario vs. Donkey Kong 2, in that the player has to aim and shoot Mini Mario toys from a rotatable cannon. The cannon can be adjusted with the mouse by rotating the adjoined wheel, and can be fired by clicking on the central button that reads "Shoot". The objective of the game is to pass all three levels by having at least one Mini Mario reach the exit in every level. The player starts out the game with a reserve of five Mini Marios, and the number of Mini Marios they have for the next levels depends on how many of them had reached the exit in previous levels.
The layout of each level consists of multiple walls and blocks placed in a maze-like manner, with multiple paths to shoot Mini Marios onto. Only one toy can be shot at a time, and it must reach the goal before another one can be shot. Mini Marios rebound off the surroundings, obtaining a coin each time they rebound. It is possible to lose Mini Marios by launching them into gaps or into Bob-ombs and Shy Guys, which are completely motionless. Hitting an enemy destroys both the Mini Mario and the enemy, leaving that spot clear at the cost of one Mini Mario.
The exit in the first two levels consists of a Warp Pipe, while in the third level, it is a Goal Door. For each Mini Mario that reaches the Goal Door, the player is awarded 10 coins. Regardless of whether the player wins or loses the game, the end screen always displays the final score, along with the best score achieved in previous gameplays. There is also the option to either e-mail a friend about the score, or replay the game.