Just tried the dice game but at first I was so confused about the units of the bet amount. It shows 0.00000000 by default, I thought it is in BTC unit but when I tried to put 0.00001 (assume it as 1000 satoshi) I got a notification "bet too small".
Tried to put 1.0000 and it is working well, means that the unit of bet amount is in ubtc/bits as I have claimed the free coins 0.00001 = 10ubtc.