The expert controls the cola bottle and pours the cola into the water glass just right, neither too much nor too little. If the cola poured is too little, the game will fail, and obstacles will be added to the level. The player can only successfully pass the level by passing through the obstacles and filling the water glass. There are obstacles of different shapes in the level, blocking the cola from pouring into the water glass. The player needs to ensure that the cola can be smoothly poured into the water glass without overflowing in order to win the game! The player can dynamically generate obstacles by drawing lines to ensure that the cola can be poured into the water glass along the predetermined route!