Arcade

• Motherload, how deep can you dig?

"Escape" puzzles

• Chronon, a puzzle spread across different parts of the day, brilliant (walkthrough)
• Hapland 1 (walkthrough)
• Hapland 2
• Hapland 3
• Escape from Rhetundo Island (walkthrough)
• others...

Classic puzzles

• DUI, OOOOH, decent physics engine in a puzzle, wahoo

Racing sim

• TG Motocross (more trials than motocross, but that's even better)

Multiplayer

• Stick Arena