I saw a great thread on Reddit about challenge sites and so as well as the challenges here. Have a look around at these fun challenge sites. A big Thank you to ASIC_SP for his contribution.
These are good for any level:
More demanding
Gaming Based
Great Archive:
/r/dailyprogrammer
Project Ideas
These are good for any level:
More demanding
Gaming Based
Great Archive:
/r/dailyprogrammer
Project Ideas