Puffer Planet (Merciless)

Puffer Planet is a special stage that consists of a boss fight against Puffsley’s Comet (Alien). This stage has no known schedule. When clearing this stage, you have a chance to unlock Mightycat. This is a No Continues stage.

Battleground

 * 4 Star Pengs spawn after 3.3 seconds100f, delay 20~23.3 seconds600~700f.
 * - spawns as the boss after 10 seconds.
 * 1 Corporal Weyland spawns after 30 seconds.
 * 1 Project A spawns after 60 seconds.
 * 4 Star Pengs spawn after 90 seconds, delay 16.7~20 seconds500~600f.
 * 4 Star Pengs spawn after 163.3 seconds, delay 13.3~16.7 seconds400~500f.
 * 4 Star Pengs spawn after 223.3 seconds, delay 33.3~40 seconds1000f~1200f.

Reference

 * https://battlecats-db.com/stage/s01215-01.html