Oh I'm not nearly skilled enough to work outside of RPG Maker just yet. I definitely want to try making 3D games in the future though. Unless you meant making it yourself in which case, go for it and most importantly, have fun doing it! I haven't played ICO but I'll check it out
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ICO's contributed to practically every game since its release.
If you have a PS2 or ps3, you can play the game.
for most optimal on ps2, though, you should play the jpn/pal version, as the north american version released first and is therefore buggy.
for ps3, it's sold as part of the ICO and shadow of the collosus collection, where the former is based on its jpn/pal version.