Translate between hex, decimal, and binary (unsigned and 2's complement signed)
Report the range of numbers that can be stored in an n bit number when interpreted as unsigned or 2's complement signed

Level 1: Translate from multiplication, division, and modulo to bitwise ops.
Level 2:Perform operations using bitwise operations when the single int is storing several 1-bit values - either the inputs from sensors or the outputs to lights.
Level 3: Pack and/or unpack multiple small values into a single large variable.