DHTML Lemmings

This game re-implements (for most modern web browsers) the first 10 levels of the classic arena-puzzler Lemmings, where a player has to assign occupations (most notably of the gap-spanning and obstacle-destroying varieties) with mouse clicks on little humanoid rodentlings in order to ward them from hazards and direct most, if not all, of them to an end-of-level goal.

Also available is a level editor allowing motivated players to design their own Lemmingian levels -- though they will need to come up with their own music and sprite animations!