I think ethereum game can be interesting and fun for playing. Also you can get free ethereum which is really good thing. Its simulator of mining, where you play arcade games and generate power and improve your mining center in a lovely pixel art style.
What about opening mystery boxes? Have you ever tried to play it? I am fond of playing drakemall and other similar mystery boxes. I found review with many stuff on themysterybox org I decided to play Unbox99 in the future.