You have to make cuicuit game in tinkercard that clearly have a purpose and serve as a life-hack or useful gadget and combine your understanding of minimum two areas of given in below:

E.g ( logic gates + transistors; logic gates to make computer memory -registers, multivibrator circuits digital or analog to make memory as well, flasher circuits + arduino)

Please make sure to add ur tinkercard link so that I can have access to it.