So they say the horizontal lines you see in the picture are really parallel! bring a measuring scale and check for yourselves.
A comical puzzle based on the classic problem of water measuring using two pitchers. Download this MS Excel puzzle : Cave Puzzle
Let the frogs leap over each other and change the sides. All three on the left side should go to right and all three on right should go to left side. Download the Frog Leap Puzzle in MS Excel.
Objective: Make All Sixteen squares the same color. Click a square to toggle the color (and those of the squares surrounding it!)
Classic Box World game in Flash version. Push the boxes to marked positions to go to next level. Use Arrow-keys.