What good games are under 100 mb and great to play?
I will start with collapse 3 and Luxor. Any more?

 

Exit and Exit 2

 

Yuusha no Kuse ni Namaikida

AWESOME game, it's only about 43MB after being compressed.

 

If you're big on old school games, Atari Classics Evolved is about 80MB.

 

Football Manager 07 and 08 both 49 odd mb for good games if you're into them.

 

I was addicted to diner dash for a few weeks.
If you're into sudoku, and have friends with PSPs, you can get Zendoku, and challenge them to some picture-based sudoku!
And I thought unripped Lumines (lvl 9 compression) was under 100 MBs?
Or was it?

 

iirc lumines as CSO lv9 was ~150MB

 

Kollon is 32 mb , also diner dash 50mb , impossible mission 50mb and activision hits.

Mojipittan(very cute music, highly recommended just to listen to) is 60mb and kanji trainer is 75 and also Zenigata pachislot(the detective from lupin). Patlabor , hokuto no ken slot and higanjima might be smaller if compressed as these isos are very small.