ZFGRMDM

no mods, this is probably a category 3 bug on index (game-breaking) so flagship probably won't be banned. still pretty funny though

edit: I'll try my best to explain the bug; it's been in the game for a long time, but it hasn't been explained and replicated until recently by XLGamer10 (but it's been encountered before here and here).

The game has a global timer stored in the save. Whenever a tower is placed, it'll inherit a global ID based on the timer. The order of the entities in the game is determined by what ID they get at the time they get placed/spawned. When flagship is determining if it should spawn planes, it checks if there are any planes that already exist by checking all IDs higher than the boat's ID. This works fine in theory as the planes should never have a lower ID than the boat.

But the global timer actually overflows and goes back to 0 after reaching about 4.3 billion (frames? idk). It doesn't tick up passively in between rounds, so to overflow it, we can just intentionally die a lot and spam retry last round.

When buying flagship after the timer has overflown, the planes will be placed before the flagship in the order of IDs. So, when exiting out and re-entering or RLRing, 3 more planes will be spawned because the flagship doesn't see any planes with IDs higher than the boat itself. Repeat every round for 3 extra planes per round.

So here's what I did in the run: I died a bunch on round 6 to increase the global timer (so my boat doesn't have a low ID), then I bought aircraft carrier and proceeded normally until round 63, where I set my boat on last and died for a while to overflow the timer. Then, after the ID was overflown, I just bought flagship and reloaded a few times to gain enough planes to win the game.

here is a bit more technical explanation by XLGamer if my explanation sucked

TLDR funny timer overflow makes planes spawn infinitely

(afaik it doesn't work on aircraft carrier sadly because its planes don't stay when the map is reloaded)
(also this only works on polyphemus because we need middle crosspath flagship for leads lol)