CRAB puzzle

Try to break the code at 4 levels with different difficulty ! Easy: Pick 4 digits from 9 digits(1-9) Medium: Pick 9 digits from 9 digits(1-9) Hard: Pick 9 digits from 16 digits(0-9, D, E, F, G, H, J) Hell: Pick 16 digits from 25 digits(0-9, D, E, F, G, H, J, K, L, M, N, P, Q, S, T, U) Too difficult for you? You can take it easy! Try playing 'Fun' mode! In 'Fun' mode, some cells are randomly removed to reduce the difficulty. Rules: Correct digit at correct column but wrong row is represented by C Correct digit at wrong column but correct row is represented by R Correct digit at correct column and correct row is represented by A Correct digit at wrong column and wrong row is represented by B Example: your guess answer 345 5D8 678 F7G 9EH 03H result: 1C1R2A1B