Gas-Powered Birds

UL 21-3 (ガス吸う鳥) is the third stage in UL 21. This stage is a remake of Prison Destruction.

Battleground

 * 3 Metal Hippoes spawn after 2 seconds, delay 0.7 seconds20f.
 * 3 Owlbrows spawn after 26.7 seconds800f, delay 0.7 seconds20f.
 * 1 Winged Pigge spawns after 46.7 seconds1400f.
 * 2 Angelic Gories spawn after 94.7 seconds2840f, delay 0.7 seconds20f.
 * 1 Metal One Horn (Metal) spawns after 106.7 seconds3200f.

Reference

 * https://cdn.discordapp.com/attachments/603673188336926721/664404290105901067/unknown.png