Object "34": Sonar

Object "34": Sonar is a single-level PWAD for Doom II, meant for limit-removing ports that was released on December 31, 2011 by Lainos. Set in a massive underwater station amid a communications blackout, Object "34" is the last entry in a series of maps created by Lainos, which began with Object "32" in 2008 and continued in Da Will's MAP10: Object "33" in 2009.

Custom things
The mod comes with a series of sprite replacements, including a fish that replaces the Wolfenstein SS and swims in indestructible tanks. Most notably, Commander Keen has been replaced by the Vortex Queen from the  series.

Secrets

 * 1) (sector 233)
 * 2) (sector 327)
 * 3) (sector 1125)
 * 4) (sector 1500)
 * 5) (sector 2301)
 * 6) (sector 2380)
 * 7) (sector 2832)
 * 8) (sector 2967)
 * 9) (sector 3172)
 * 10) (sector 3250)
 * 11) (sector 4287)
 * 12) (sector 4371)

Current records
The records for the map at the Doomed Speed Demos Archive are:

Things
This level contains the following numbers of things per skill level: