You would probably want to separate your numbers with some kind of delimiter like a space or comma or something so you can tell where one value ends and the next one starts.
For example, if you had HP$="1337" and SP$="42" you would end up with GAMESAVE$="133742", and there is no way to say you didn't start with HP$="133" and SP$="742".
You can then use INSTR to search for the delimiter.
2そうだね プレイ済み