Water Defense is a tower defense game in which the goal is to use ACO products to protect the lake from contaminated droplets.

The game contains 1 map.

There is an inventory with 4 types of products, each type has different properties. Some types can destroy droplets, others for example generate coins.

The lake can be attacked by 2 types of droplets - water and oil. Each type can only be destroyed by a specific type of product(s).

Droplets attack the lake in waves. For each droplet destroyed, the player receives a score and a certain number of coins with which he can buy ACO products and place them around the map. Each subsequent wave is slightly stronger - the drops are faster and have more lives. If any drop gets into the lake, the lake will lose a certain number of lives. Once the lake runs out of lives the game ends. The goal is to get as far as possible and collect the highest score. There is no limit to the number of waves.

As a bonus, the game contains the so-called ACOpedia, an encyclopedia containing around 75 interesting facts about water. With each successfully completed wave, 1 fact is unlocked.