- Faerie Bubbles is probably my favourite of the flash games on the Neopets Site. I got semi-addicted to it while I was trying to obtain the avatar, and it must've paid off -- I have it now.
- NeoQuest II would have to be my favourite PHP game. I've beaten it over five times now and I'm fairly sure it's not going to get old any time soon. Its predecessor, NeoQuest (what else!?), isn't too bad, either.
- All of the Hannah games (HatWoA doesn't count) - HatPC was the first Neopets game I've eever played, and I have the old Games Room banner to thank for that. HatIC might've been my second, but I don't exactly remember. I ignored for a while because I got stuck on the first level -- you see, I did not know how to switch to Armin. I 'finally' figured it out after reading the instructions.
I was delighted when HatKC was released; I'd been longing for a new Hannah game for years. (Again, the Wardrobe game doesn't count. :P) I've completed the first two games several times now, but I haven't beaten the third yet.
^ This one ^
I'll post more of my favourites in another post.