At the beginning of the game, you can only plant one kind of plant, the snake plant, which will give you oxygen every few seconds. In order to increase the oxygen production, repeatedly click on the plant (for each tap, you'll get an oxygen bubble). These oxygen bubbles let you buy new plants and upgrades, as well as level up. When you reach a specific number of oxygen bubbles, you can unlock new levels that include more kinds of plants. You can also invest the oxygen molecules to upgrade your plants and increase the oxygen production.
On the other hand, you can change the location of your plants in order to organize your terrarium and make it look however you want.
Terrarium is a simple game with absolutely beautiful visuals and a super calming effect. The best part is that you can forget the game and your plants will keep growing little by little to give you a beautiful surprise whenever you decide to play again.
Android 4.1 or greater is required.