First echo
Score 3
+10 XP · +10 coins
📡 Echo SoundingPlay
Several reflectors are hidden on each grid. A ping reveals the distance in horizontal and vertical steps to the nearest one. Compare the answers and mark the cells where the reflectors must be. Once you have placed every mark, check your solution: an incorrect check gives another clue but increases the cost of the solve.
Each ping costs one move. Aim for the solver’s par to earn points toward your cumulative score. Each day offers three grids at different difficulties, and the title-screen arrows open earlier days. Play with a mouse, touch screen or keyboard; your progress is saved in your browser.
Achievements 8
Keen listener
Score 30
+20 XP · +15 coins
Reflector finder
Score 100
+40 XP · +30 coins
Echo master
Score 300
+80 XP · +60 coins
First launch
Play 1 times
+5 XP · +5 coins
Regular player
Play 10 times
+20 XP · +10 coins
Veteran
Play 50 times
+50 XP · +25 coins
First record
First personal best
+10 XP · +15 coins
Top scores
No scores yet — be the first
PlayHow to play
- Choose a grid. Open one of the three puzzles for the selected day.
- Send pings. Select cells and compare their distances to the nearest reflector.
- Mark reflectors. Switch modes and mark the cells where you think they are hidden.
- Check your answer. When all marks are placed, check the solution.
Controls
| Keys | Action |
|---|---|
| Mouse or touch | select cells and press buttons |
| Arrow keys or WASD | move the cursor |
| Space | ping or mark a cell |
| M | change mode |
| K | check marks |
FAQ
Do I need an account?
No. Guests can play and keep progress in their browser.
How are points awarded?
A solve at or under par earns three points, one move over earns two, and any other solve earns one. Points are summed across solved grids.
Can I play past days?
Yes. Use the arrows on the title screen to visit earlier days.
Similar games
Licences and credits: Arkai (Echo Sounding), MIT — ATTRIBUTION.md