ARENA IDEA!
Everyone goes into their games with a cat or dog which they have to look after during the games or they wouldn't get sponsors, the animals are basically cameras to record the games and the victor gets to keep all the alive animals after the games or the camera gets deactivated and given to people who pay the highest in the capitol
Everyone switch places randomly throughout the games, so people try to put themselves in danger (then the switching doesn't happens) 💀
The Victor of a certain games gets invited to redo their games with actors and they have to relive it again, and again :)
Bird box with vision and sound
Everyone loses feeling in their bodies before the games so it's impossible to know when you've been hurt (most people died of infection that year-)
Plague arena! Including plague doctor mutt
Or a illness which makes you go LITTERALLY feral and wanting to kill everyone/ everything in sight in the night
The floor is lava arena (the floor LITTERALLY becomes lava at certain points (no warning))
Cannibalism below