Fishy

All of these clients are allowed: https://fishy.moe/client-cheating-archive

And Anything custom you can build/test or want to try out the server backend works with seasons so every year their are 3 seasons which means the leaderboard is constantly fresh but your total PP and Best is still gathered for an all time rank.

dev.fishy.moe is a special playground for testing & developing unreleased cheats to apply in future for kawata.pw. It runs a kawata backend with customizations from bancho.py-ex. The backend is fully reworked and rewritten for this purpose, so it stands as a "sister" build of kawata dedicated to testing.

To connect a cheat or osu! client for testing, launch osu! with the -devserver fishy.moe switch, then log in with your fishy.moe account. The server runs fully over HTTPS, so the client reaches it on the standard bancho subdomains without extra setup.