Aus der FAQ:

Unlike the original game DHTML lemmings requires a lot of resources (around 10 - 20MB of memory) and a fast processor to run smoothly. A 500MHz processor will do, but above 1GHz it becomes much more enjoyable. You will need at least a 2GHz processor for the fast forward mode to work correctely.

Javascript isn't a fast programming language because it needs to be interpreted at execution time. However it does have the advantage that most browsers are javascript enabled, so you won't need anything more than a modern browser.

DHTML Lemmings has been written to work in IE5.5 and above and in recent Mozilla versions (around 1.3 and higher). Other browsers (such as Opera) may or may not be able to run DHTML Lemmings

Note that this project is a work in progress, by no means is this demo complete and free of bugs; feel free to report anything unusual to me.

Den kompletten Sourcecode als ZIP gibt's unter der GPL, genauso das PHP-Skript zum Level generieren.