Gambling Outcast Kaiji: The Kazuya Arc - Kaiji Part 4 - Vol. 4 Ch. 34 - Glory

[MangaDex]

 

[Levankua]

"Someone set us up the bomb"

 

[BakedBanana]

"A bomb... In their minds!" (Page 16)

Could it contain the history of each contestant past? Knowing this will could cause the stakes to rise since they understand what will be lost if they don't get the money. We've already seen how much they value eachother, so this'll work against them.