Mario vs. Donkey Kong: Mini-Land Mayhem! is a 2010 puzzle video game developed by Nintendo Software Technology and published by Nintendo for the Nintendo DS. It was announced at the Electronic Entertainment Expo 2010 and released in North America on 14 November 2010. It is the fourth game in the Mario vs. Donkey Kong series. Gameplay Mario vs. Donkey Kong: Mini-Land Mayhem! is a platform game with a 2D level design. Similar to the old Lemmings games, the puzzle-based gameplay in Mini-Land Mayhem is built upon that of the 2 earlier Mario vs. Donkey Kong titles, where players do not control Mario, but instead are tasked with guiding wind-up miniatures to level exits, in this case mechanical Mini-Mario toys. The game requires players to "build and rebuild levels on the fly," to allow the small miniature Marios to get from point A to point B. As the mini-Marios cannot be directly controlled, the player instead uses a stylus to manipulate their movements. Each level has one to three minis that must be moved, and it is necessary to rescue all the minis to clear a level, and each exit closes several seconds after a mini enters. If a mini falls onto spikes, traps, pitfalls, run into enemies, falls from a height of ten blocks or more, or the timer runs out, the player gets a game over and can either restart or exit the level. Once a single mini has reached the door, a timer comes on, and everyone else must be through the door within about six seconds, otherwise, the door will lock up, leaving out any other mini toys behind and it's Game Over. Unlike Minis March Again! and previous installments of the series, it is not possible to stop the miniatures or change their direction once they are activated. There are eight themed "worlds" in the theme park, with eight levels each leading to boss battles. A zoomed-out map view on the upper screen helps players navigate worlds. Each world has a different type of object to interact with. The first world involves building walls and floors, using red girders to serve as bridges, walls, and ramps. Later players gain access to magnets, conveyor belts, and springs, as well as other building blocks for directing the robot army such as trampolines and repositioned platforms. Each world requires the player to use that world's specific tool to defeat