Defend the core by creating sound waves!
Mouse: Click and drag to draw a line, release to unleash a wave.
Keyboard: Press 1, 2, 3 to switch between wave modes (Normal, Focused, Wide).
Keyboard: Press SPACE for Echo Burst (clears nearby enemies).
Touch: Tap and drag to draw a line, release to unleash a wave.
Triple-tap quickly anywhere to cycle wave modes.
Double-tap the core for Echo Burst (clears nearby enemies).
Collect power-ups to gain temporary boosts.
Progress Bars: Bottom left shows the Fever Meter (fills with combos) and Echo Burst Cooldown.