Personally

Since the ads are sound-only, it's easier than others. After about a month, I was able to exchange for about 600 yen. Due to the reward system, the more you play, the fewer points you get, so the efficiency decreases from now on. There was an update recently and the points you get were reduced, so I'm quitting. Personally, I recommend it, but I think it's fine to quit after exchanging for 1000 yen. Addendum: Apparently the ads are no longer sound-only! Not worth it anymore 😓