If you are lucky one to discover treasure, you will see screen like above. But don't get excited yet, because some treasure box might lead you to trap or monster! You will see 3-6 treasure chests on the screen and you have to pick one. If you pick the right one, then you will be rewarded with some item or equippable item. You have choice not to open (by pressing "Q") and in that case treasure chest is still available for you (treasure chests icon appeared where you are standing and remain like this while you are on the stage. If you step onto it again then you have option to open it)

KEYPAD NAVIGATION

Keypad Description
Left, Right Move focus
Center Clicked focused treaure chest
Q Exit (without opening treasure)