Stacker by LAI Games
LAI's Stacker is a skill tester game that requires players to test their concentration and patience in order to gain prizes.
There are two levels in the game - minor and major. And the object is to stack as many moving boxes on top of each other without the pile toppling over.
The player can either choose to stay at the minor level, which requires them to stack 11 moving boxes on top of each other, or they can try their luck at stacking all 15 boxes on top of each other successfully.
The minor level guarantees the player at least a minor prize. But if they suceed in the major level, they can earn prizes of a much-higher value.