I remember we can choose:
1) entrance ticket, and then you buy game ticket at each stall
2) entrance tickets + unlimited games
Last year, we bought two adult tickets (with unlimited games) for me and my husband. My son didn't need a ticket as he was under 3 years old. Then three of us could play all games in 富士急 (for child and adult). However, there're height requirement on some games, especially the adult games.
We just show the ticket to the staff whenever we want to to play the game.
If you won't play not many games, you better buy entrance fee only and buy game tickets at each stall. 總之就係玩得越多就越抵.
I sent you my phone no. and you can call me to chat if necessary.