A simple astable multivibrator. Due to the small number of components available in the playground there are no two components with the same value so I had to use different value components for the two sides of the multivibrator which is why it’s unbalanced, but I did manage to make it have a roughly 50% duty cycle. Also, if I set the simulation to simulate at 1s/s then it stays in sync with the real life circuit for about 10 or 20 cycles, which makes sense given that most components have a 5% or 10% margin of error.