Finally got through the last stage with all 3 medals. It took a bit of experimenting but I was able to pull it with two squads heading for the two crashers and two fast teams to go through the webs at the top. Insert epic boss music and this event is over for me. Better start saving those cakes for Edelweiss.

For the randomly curious, this is my standard squad and they get through almost every stage the game has thrown at me so far, including the last 3 event stages:

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Rather easy to rearrange their positioning on the map at their different speeds to make them reach main objectives. Some RNG is of course involved but i did oneshot the 3 last event stages with the squad.

Meanwhile, this is the squad i used for ?-5. First time i had to make sacrifice teams:

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In essence i did not want to play around with speeds on this map so i made them all about the same speed so that they would all reach the arrow tile on the same turn. This meant team order was the only thing that mattered, and is a lot easier than playing around with speed differences. First team has an evolved bronzie in it so it can at least take down the first enemy since they move first out of all teams, but they will die to the other enemies later.

After a few tries, I realized I was overthinking it and ran my standard balanced power team setup for ?-8. Helper was some 50-60k power team with about the same speed as my teams.

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Put squad 1 on the bottom, rest on the top, and then just mashed next to victory. With no solar blast use, the bottom team cleared out the bottom boss and got the final boss to about 1/4 HP before dropping, then I just waited for one of the squads to get out of the loop and finish the map. I made sure the team that went down had no defense buffs, otherwise the evolved characters are too tanky.

Finally got 3* on ?-5 and the game crashed. Reloaded the game and I somehow lost 140 stamina. Yay