1-45 N77 NEBULA
1-45 N77 Nebula is the 45th stage of Cosmos Ch.1 — Beyond the Exosphere. Previous stage: 1-44 Crimson Star. Next stage: 1-46 Andromeda.
Project A is Alien. Anti-Alien units take less damage and deal more.
GROSS CAT A Its True Form is Strong Against Alien, giving budget anti-Alien value. 
LI'L GROSS CAT B True Form has a 30% Knockback vs Alien. 
WHEEL CAT A Deals Massive Damage to Alien enemies — a huge area nuke against Alien crowds and bosses. Also fits “Clear the crowd.” 
SURFER CAT A Area Freeze vs Alien controls Alien groups. Also fits “Clear the crowd.” 
CATMAN S Deals Massive Damage to Alien in every form. Also fits “Clear the crowd.” Project A reaches 451 range. Units that out-range it can chip safely without taking hits.
MEDITATION CAT C Range 600 — fires from beyond its 451. 
NERD CAT A Range 1200 — fires from beyond its 451. Also fits “Clear the crowd.” 
GUNDUROS S Range 500 — fires from beyond its 451. Also fits “Counter Alien.” 
DRILLER CAT A Range 460 — fires from beyond its 451. 
MIGHTY REKON KORPS S Range 470 — fires from beyond its 451. Also fits “Clear the crowd.” 8 enemy types stack up here. Area attackers hit the whole push at once instead of one unit at a time.
VALKYRIE CAT A Hits the whole group while it freezes them. WHEEL CAT A Hits every Alien in a wide area at once, melting grouped Star Aliens. Also fits “Counter Alien.” NERD CAT A Evolved/True hit groups over a Long Distance band. Also fits “Out-range Project A.” CATMAN S Long-range Area damage clears groups. Also fits “Counter Alien.” 
ACTRESS CAT B Hits multiple enemies at once for budget crowd damage. Project A boss in the Mystery Mask cluster. CRITICAL stage for The Cat God — collect this Mystery Mask treasure.
Project A boss + the second Mystery Mask treasure. Project A has 600~1500 Long Distance range — outranges almost everything that's not a Bahamut variant. Community loadout: A. Bahamut (anti-Floating) to rush past his range → Mohawk meatshields → Anti-Alien backline. The ROW1 restriction is forgiving here since your front line is what matters. Required for The Cat God's stat fix at 1-48; superior treasure (~30% drop) should be your goal before moving on.
The castle you destroy to clear the stage.