This game is free but the developer accepts
your support by letting you pay what you think is fair for the
game.
Included files
Invaders - Teacher Guide.pdf (2 MB)
Invaders - Introduction.pdf (867 kB)
Invaders - Alien Message.pdf (60 kB)
Invaders - Puzzle - Percent.pdf (68 kB)
Invaders - Puzzle - Inequalities.pdf (72 kB)
Invaders - Puzzle - Unit Circle.pdf (118 kB)
Invaders - Solution.pdf (320 kB) at $2.00 USD