- Blackout
- Faster Than Light
- Hex Board
- Invariants
- Listening To OEIS
- Logic Gates
- Penrose Maze
- Syntactic Sugar
- Terminal Colors

The OEIS has a feature where you can listen to sequences. Here are some good ones, and also Pi.

My favorite, the number of zeros in the binary expansion of n:

Denominators in the concatenation of all Farey sequences:

Digits of Pi (basically random):