If any system is well-suited to guiding chains of lemmings through levels filled with danger, it's the DS ... and thanks to homebrew
developer Matt, that potential has been realized. LemProject brings a homebrew Lemmings
game (based from the Amiga version) to the DS, with full stylus functionality and all the tools you need to build your own levels. And if you're the type who wants to dig around on the back end, it's all open source.
It's not perfect -- not all the old levels could be transferred to this game, there are a few reported bugs, and some people are pulling sad faces that it doesn't work with DS-X, but nothing's perfect. All in all, this looks like a great homage to a classic.