All 6 games go. The case for the games say "works with all Leapster Systems" and on the back it says works with Leapster, works better with Leapster2. I don't know what the gs is but you could probably google it at Leapster.
The leapster GS is the explorer system & I did some research & found that the explorer games do not work with the leapster or leapster 2 systems. Same goes for any of those games on the explorer system. Sorry about that. But I looked them up because I was seeing all kinds of explorer games for sale at Walmart & I just won an auction for the Leapster 2. If you want to look it up, you can. Just thought I'd be helpful & let you know.