Echo Chamber was made for 7 Day Roguelike Challenge 2026.

•  the version playable on itch.io has extra bugfixes.
•  echo-chamber-7drl.html is the submission for 7drl

Your submarine must find and secure confiscated document capsule hidden at the end of the undersea cavern. Without sonar sight will be limited. However, when you use the sonar to find enemy, the enemy will learn your presence as well...

• movement: LMB / wasd / arrow keys
• launch torpedo forwards: z
• launch torpedo upwards: c
• drop depth charge: x
• turn on/off sonar: q

By scarf

Made with AI using gpt-5.4 on opencode from 2026-03-07 to 2026-03-08

Font is 3270font by rbanffy

Music by Kevin MacLeod

"SCP-x2x (Unseen Presence)" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/by/4.0/
Credit for Other SFX are in-game