Cell to Singularity Wiki

Ideas are the second currency unlocked in the game and are used to progress the Civilization section of the tree. Ideas are used to purchase upgrades for each Age of Civilization. They are unlocked after obtaining the First Idea upgrade which costs 901B entropy



Ideas can be produced by unlocking the idea brain you can get it by getting the Stone Age,the segment of the Tech Tree containing the Civilization section (once the Stone Age has been unlocked), the Civilization gardens, or simply clicking near the Civilization tree.

if you have purchased the Rover which unlocks Mars, tapping on Mars in the space garden also gives you ideas.