Objective: Recreate the given setup.
9 variants (including 3 randomized variants)

Click the board anywhere to let the system randomize the setup.
You will see 16 tokens being dropped carrying the numbers 1 through 16.

Click one of the green arrows to cycle a row of 4 numbers to the right.
Click one of the red arrows to cycle a row of 4 numbers to the left.
Note that rows which contain three or less tokens cannot be shifted.

Click one of the blue arrows to shift a row of 4 numbers up or down.

You win once you have recreated the original setup (ordered numbers 1 to 16).

Variants:
The fixed variants asks you to swap two tokens (solutions attached).
The set of six variants with fixed setups together shows that in this game any random setup is solvable.