Ok so this might be a little long but these were the strays I used to beat them.
Stage 1: Run around in a circle around the arena until 3 launches their Inkjet. Keep on running around until 3 shoots off 5 shots from the inkjet, then ink around where 3 will land, and go in for the kill.
Stage 2: Wait until 3 uses Bubbler, then push past the bubbles and attack the source.
Stage 3: There’s not too much of a strat for this one so this is definitely the hardest stage. Stay mid-range and attack early on in 3’s autobomb rush before the whole arena is covered in them.
Stage 4: The easiest stage by far. Dodge the Tenta Missles, throw two bombs on the UFO and then 3’s toast (for the time being)
Stage 5: Hide behind the wasabi case thingy or the cylinder thingy while 3 uses a splashdown frenzy. Make sure you’re always in the opposite direction of where 3 is about to land. When 3 is done with the splashdown frenzy, go in for the kill. Keep in mind that if you don’t kill 3 in time after the Splashdown frenzy, they’ll start another one. So make sure not to stray too far away from cover.
Some final tips: try not to ever be idle. After a stage is over, listen for the sound of walking autobombs. Run away from them if there are any leftover. In between stages also try to ink the stage as much as possible, but keep an eye on your ink tank.
That should be it! Good luck soldier 🫡