All Products by Valve

Portal 2
Common Sense Rating Not Yet Rated
Teacher Rating Not Yet Rated
$19.99
Portal 2 Puzzle Maker
Mind-bending level editor for beloved physics game
Common Sense Rating 4
Teacher Rating 5
Grades 7-12
$19.99
Science
Creativity, Tech Skills, Critical Thinking
Garry's Mod
Complex physics sandbox is daunting but rich
Common Sense Rating 3
Teacher Rating 4
Grades 8-12
$9.99
Science
Creativity, Tech Skills, Critical Thinking