Four power cells.
Power cells (technically batteries) are used as currency in Run 3. They unlock characters, costumes, and upgrades, and they are also required to continue after falling in Infinite mode.
Power cells are primarily earned in Infinite mode. They are initially scarce and low-value, but they become more common and more valuable. They reach maximum frequency around 1200 meters, and maximum value around 2000.
There is an upgrade that gives the player the permission to refer to power cells as batteries. It can be bought in the shop for 15 power cells, and it unlocks the cutscene 'Batteries'. The cutscene appears to show the end of a conversation between the Student and the Skater over whether power cells should be called batteries. The Student tells the Skater that "power cells" and "batteries" mean the same thing, and everyone already uses batteries. The Skater argues that saying "power cells" sounds smarter, to which the Student responds, "Who cares about sounding smart? Just talk normally." The cutscene can be viewed again by clicking on the upgrade in the shop after it is bought.
Infinite Mode Trivia
- Power cells get more valuable the further you go, reaching their maximum value at 2000m.
Other Trivia
- The developer decided to call the in-game currency power cells/batteries because he felt that coins would have been too generic.
- Power cells are activated automatically. If one is let go inside or near a tunnel, it will activate.
- Power cells are tetrahedrons because the manufacturer was running a marketing campaign centered on the number four. (These new batteries could store almost four times as much power as the current best-selling batteries.)
- Power cells can be combined by putting them end to end. They can also be connected to a circuit.