Don't get too close to your neighbor
2:00:39
A 100% Rated Puzzle; 5/5 Difficulty. Hold My Beer. (For 2 Hours...)
25:18
Working together in the Fog
35:30
March of the Quads: Mirror Maze
26:51
New divisibility rule! (30,000 of them)
25:01
Following the trail of Dots
13:33
How To Calculate Any Square Root
18:38
Pentomino Facts
33:00