Fill all of the empty space with the elongating blue square.
Use your arrow keys to move the growing rectangle.
40 puzzles to solve in all!
Fill Tracks - Learning Connections
Problem Solving - 40 brainteasers
Geometric Thinking - play with filling unique configurations
Spatial Reasoning - visualize
Common Core Connection
MP1 - Make sense of problems and persevere in solving them.
MP7 - Look for and make use of structure.
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