Don't pick on him even though he's a n00b. I'll try to explain it to him, friendly.
carrot, I'm sorry that you don't know that Jazz Jackrabbit 2 (version 1.20-1.23) came out in 1998 and they are old versions. Jazz Jackrabbit 2 The Secret Files (v1.24) got released some time after and has all what v1.23 has got plus the Jazz Jackrabbit 2 Holiday Hare '98 (v1.23x) episode and a brand new "The Secret Files" episode with 9 levels. TSF has also got a new playable character too, Lori, unlikely in v1.23 and below it is only possible to play with Jazz and Spaz.