LOGIC, PUZZLES, PROBLEM SOLVING, ETC.
The Daily Tangram Puzzle
http://www.shockwave.com/gamelanding/daily-tangram.jsp
Math is Fun- Tangrams
https://www.mathsisfun.com/games/tangrams.html
ABCYA Tangrams Game- Try the Higher Levels!
http://www.abcya.com/tangrams.htm
Four Piece Tangrams
https://www.mathplayground.com/mobile/pre_tangram_puzzles.html
Parking Lot- Problem Solving
http://www.mathplayground.com/logic_parking_lot.html
Coffee Shop- Problem Solving
http://www.coolmath-games.com/0-coffee-shop/index.html
Sudoku
http://www.coolmath-games.com/0-sudoku
Kakuro- "Sudoku's Cousin"
http://www.coolmath-games.com/0-kakuro/index.html
Squigly's Brainteasers
http://www.squiglysplayhouse.com/BrainTeasers/Rebus.php
Count the Cubes- Spatial Awareness/Reasoning
http://www.mathplayground.com/cube_perspective.html