Hi and welcome here zeminia!
Yeah, well... sorry if there's nobody else here answering you, I'm the first one I guess!
I never played gaia before, but it seems to be a good game.
To play Lemmings, you can get it over the web. You can go on
my website in French to get all lemmings versions you want. These are: Lemmings, Oh no more Lemmings, Lemmings2, Lemmings3, Holiday Lemmings and Cheapo Copycat.
Enjoy! B)