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They have to find the cassette and play it (which is a game. for eg let’s say level 1) and after playing it, they need to save it so that can proceed with another level. There’s the time limit within which they need to find the cassette and save it. Finding game items will help them find the location of the cassette. If they don’t save the cassette after finding it, they will end up playing the same scenario again. Bada has now found the end cassette which is like the last level. So, when they reincarnated again, the end game started. Now they need to play it and then save it for the game to be over. But it seems the ML doesn’t want the game to end since it means bada and he will probably separate. Also, i believe if a player saves a cassette, they will realize they are inside the game once they reincarnates again.