https://wallet.testnet.shiftnrg.org/
Make an account, go to applications > Phantom > Open > Open anyway
Welcome to the playground. Obviously since it's testnet nothing is permanent  and there's always a chance you run into bugs. To the best of my knowledge the official wallet will let you do everything, but you could always run your own test node on an Ubuntu setup very easily.
https://github.com/ShiftNrg/shift/releases