Ape Escape 2 is a PS2 game and so is Ape Escape 3 and Ape Escape Pumped and Primed. They all must be redeveloped before they work work on the PSP unlike Ape Escape which was a Playstation game

There are at least eleven ape escape games including racing, party, and academy games. The regular games are: Ape escape (ps1), Ape escape 2 (ps2), Ape escape 3 (ps2), Ape escape million monkeys (ps2), Ape escape SaruSaru big mission (ps2) and Ape escape on the loose (psp). The other games are: Ape escape pumped & primed (ps2), Eye Toy: monkey mania (eye toy/ ps2), Ape escape academy (psp), and Ape escape academy 2 (psp). Happy hunting!

in japan. Huge!!!!!!!!! all the ape escape games went to the best of best series. Ape escape 3 did well in America and UK as well but did not reach platinum. If you wan't the better version get ape escape 3 UK! Don't bother with ape escape primed and pumped. most reviewers gave it 4/ 10

Ape Escape Racing happened in 2006.