Got this on the second attempt I believe. This can be tough since you have to complete 3 battles in a row without a save. You do get chances to change team loadout between battles.
Didnt expect to win after choosing the boomshot rabbid, which I had not upgraded his weapon for in a while, so it was very weak. Realised after I chose him. Mario also needed health but I believe the vampire shot from the rabbid ended up helping replenish health for the teammates as well.
Sometimes changing party loadout makes a big difference. I changed it because princess rabbid had low health and I would have had to waste healing immediately at the beginning of the match.
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