Shield
Drag the shield left and right with your finger. A touch does not move the shield. The shield follows your finger as it slides.
Balls and rings
Every ball puts a ring where it will land. The ring shrinks, and the ball lands on the shield line when the ring closes.
A heavy ball is bigger, spiked and slower. It does 2 damage to the boss.
Returns and damage
A caught ball flies back to the boss. The damage counts when it hits the boss.
Perfects and Echoes
Catch a ball with the yellow center of the shield for a Perfect. Three Perfects in a row send 2 extra Echo balls at the boss. An off-center catch resets the streak.
Hearts and time
You have 3 hearts. Each missed ball costs 1 heart. The boss has 20 health, and a run lasts 30 seconds.
Bring the boss health to zero before the time ends and you win. The run ends when your hearts run out or the time is up.
Leaderboard
Wins come first. A faster win ranks higher. On a tie, hearts left count, then Perfects.
Only the best run of each player counts. Retries do not add up.
Fair play
The server replays every run with the same game engine and checks the result. No purchase or ad changes hearts, time, shield or ball speed.