Pick a game to load. GB/GBC and GBA run in your browser via EmulatorJS cores (gambatte / mGBA). Autosaves every 5 minutes. Cheat codes supported. v4 — if you don't see v6 here, fully close the tab and reopen it.
Progress & safety: Autosaves every 5 minutes (per game, in your browser) AND every in-game save is copied to a disk backup on this Mac (~/Games/web-play/save-backups/). Hit 💾 Backup Save Now before opening the save editor — if an edit ever corrupts a save, restore the newest backup from disk.
Editing your Pokémon (pick any species, level, abilities, IVs/EVs, moves, shiny, item counts, badges, dex): click ✏️ Save Editor → in the emulator toolbar press Export Save File → in the editor open that .sav → change anything → Save → press Import Save File in the emulator and pick the edited file.
Cheat codes: ☰ menu → Cheats → Add Cheat → Import from Database shows the curated picker (your game is auto-selected). Or paste codes manually — one per line, description required, tick the checkbox to enable.