Give up, Robot - Do you like epileptic seizures and grappling hooks? If so, try this game out! Plus it has a GLaDOS-esque voice taunting you whenever you die. 42 and 50 (the last one) were the hardest for me.

Here's my scores the first time through:
Time:
39:01.88
Score:
18,594,870

Gluey - This one was a little more relaxing at first, and by now you know how I love Tetris variants, but there were a few levels that started jacking up the difficulty big-time. Levels 1-9 were a walk in the park for me, but then I must have played level 10 at least 25 times before I just barely got enough points to go on. Finally, I just gave up on level 16