Suggestion: Add 0 as input in INPUT 2.0
Bug: The exponent being invisible with all stones greater than 100 and their exponent being 5 or higher, this affect 128, 160, 192 (and other multiple of 32) and 243 (not possible but need noticeable).
At least softlock bug is fixed after I play -169 (or any multiple of -13) in sandbox, which make 2 cards cost 169 less. Speaking of -13n stone (13 stone, -1 stone and other stones combined), may the value display be changed to -X instead of +-X?
Also for people who don't know how 121 stone work, it's basically 11 but radius is increased by 1, which spread 2 spaces orthogonally and 1 space diagonally, which is somehow more powerful than 187 stone (spread 1 space orthogonally and 1 space diagonally).