Press space to calculate pi. Turbo mode! Shift+flag (credits to @Jord4563 for reminding me about turbo mode).
Versions: v1.0 Basic six digits of pi being calculated. Give it some time to calculate. v1.1 Sped up by a quarter, 17 digits appear. v1.2 Sped up by only a tenth, but it's still quicker! v1.3 Fixed