Algebra
Equations fall from the night sky one at a time. Steer each comet onto the landing pad with the answer before it touches down.
Steer the comet
Arrow keys, 1–4 or a click. The wrong pads are the answers common slips give, so check your work.
Lock it in early
Sure of your pad? Press Space to drop the comet now. The earlier you lock in, the bigger the bonus.
Survive the speed-up
3 lives. A comet on the wrong pad costs one. Every five catches, the sky speeds up a little.
Linear
3x + 4 = 19
From launch
Both sides
5x − 3 = 2x + 9
After 5 catches
Two-step
(x − 2) ÷ 3 = 4
After 5 catches
Percents
25% of 80
After 12 catches
Systems
x + y = 9, x − y = 1
After 20 catches