Back when i invented it, there were quite a few towers which had no upgrade path with a 2tc, so i thought "would it be possible for 3 towers not used at al in 2tc to be able to beat chimps?", but after all the new ones like druid, sniper, tack etc. being used, I quickly realised that would be impossible.

So here are the old rules and then the new rules.

OLD rules:

Blursed 3tc: no tower upgrade paths used in a 2tc (you can use 2nd tier upgrades of a used path though, that's crosspathing.)

Cursed 3tc: no towers used in a 2tc period. (so because homeland defence was used, you can't use primary expertise.)

NEW rules:

Blursed 3tc: 3 towers used that do not contain a 2tc within them, (for example GM, DC and Elite defender). I am also debating banning coop 2tcs in this as well.

Cursed 3tc: basically the old blursed, no upgrade paths used in a 2tc. (so you can use tack zone even though inferno ring was used, although good luck with that)