The maze is invisible. You stand in pure black with nothing but your own breathing pulse — until you send an echo ping. Its thin white arcs sweep outward and briefly light the walls near you, fading with distance, while every tile the sound touched stays dotted in your memory like a dot-matrix map you paint yourself. Memorise, navigate, and if one lucky echo reaches the exit, it reveals its glowing glyph once — and forever. Spend fewer pings than the par and you rank S; burn your last echo calling for one more and the dark keeps what it takes.
How to play
Arrow keys (or WASD) step through the corridors one tile at a time.
Space fires an echo ping — it lights walls around you and is your only way to see. Each paid ping counts against the level par.
An echo that reaches the exit reveals its pulsing glyph once; then head for the light.
Clear all 5 levels (7×7 up to 15×15 cells); fewer pings vs. par earns grades S through D.
Ping after your last remaining echo and the run is over — think before you ping.
P or Escape pauses, M mutes, R resets the current level. On touch screens: tap yourself to ping, tap a side or swipe to move.