Bridges  
Entrapment
 Rearrange the gray circles so each red circle lies on the midpoint of
a segment connecting two gray circles. See also, Geometry
Of Entrapment. 

Lunar Adventure  
Rational Numbers Triangle  
N Piece Tangram  
Similar  
Factortris  Plays like Tetris, but you make the shapes..  
Eyeballing Game  geometrically, find the midpoint, angle bisector, etc.  
Greater Than Sudoku  this is challenging  Click HINT to get started, if needed. 

Set Game  
FourSight  3D Tic Tac Toe  
Hyper Frame  
Decanting Puzzle  To pour, drag and drop. There are 6 levels.  
Rush Hour  
Hexagons  
Click here for the Index for >> Online Math Games, Demonstration/Exploration Tools, and Puzzles
by: James
R. Olsen, Western Illinois University
updated:
November 29, 2011