Root + Impact

Description

• Each time claimThrone() is called, claim fee increases:

But there is no max cap on claimFee.

If feeIncreasePercentage is 100, then:

• First claim: 1 ETH → next fee = 2 ETH

• Next: 2 ETH → 4 ETH

• Then: 4 ETH → 8 ETH

• Very quickly: 32 ETH, 64 ETH, 128 ETH...

Eventually, no one will be able to afford it → game freezes

Risk

Likelihood:

Impact:

• Game freezes after few rounds

Proof of Concept

Owner sets feeIncreasePercentage = 100, then lets the game run for 5–6 claims. Observe claimFee becomes unaffordable.

Then try calling claimThrone() with large values — eventually, no player can afford it.

Recommended Mitigation

Add a maximum cap to claimFee, like the below code

Or set a maximum feeIncreasePercentage during config (e.g., 25%).