Gems

Yes. Matches cost nothing. Robux is optional and buys coin bundles, a mythic pack, a 2x speed pass, and skip passes. Coins for summons also come from wins, a one-time group reward, and codes.

Aligators Games, the Roblox group credited on the experience, with aibat303e and iop_dev named in the description. This wiki is not run by them.

In the lobby, step onto a match platform. The official description says that starts a match. Then place a Cameraman or another unit you own where it can hit the toilets, and beat the waves.

No. Coins are the lobby currency for summons, crates, and code rewards. Match cash is what you spend during a wave on placement and upgrades. A crate purchase does not pay the upgrade cost of the unit you pulled.

The public title still includes X2, and one October guide describes a double-coins counter on the match HUD. That is not a damage multiplier, and the game page does not publish a rate. Read the live counter before you plan a farm.