Lemmings is a puzzle platform game developed by DMA Design. The objective is to guide the lemmings through the level to the exit. The trick is you cannot control the lemmings directly, which walk mindlessly about the level, even off deadly drops. You can, however, assign abilities to the lemmings to help them reach the end, such as stopping others from walking off the edge of a deadly drop, or building a bridge over the gap. Abilities are limited though, so careful thought and planning are necessary to ensure the required percentage of lemmings make it to the exit.