Sodoffu, a new number grid game, more difficult than Sudoku

If you like Sudoku and similar number games, try Sodoffu ! Sodoffu, a new number grid game, more difficult than Sudokunumber 2 - same rules as before - the clue is that blocks X, Y and C should be in a logical number progression. Sodoffu grid number 2

(People are already saying this is too difficult so here's another clue: top block (X) does not necessarily have any relationship to the bottom block; this gives you more freedom. Yet another clue: the logical number progression can be inverse or negative.)
A prize is being given away this time- a copy of Not For Bedtime horror/murder/etc story book will be awarded to the first correct entry received by e-mail
please do not send in answers without being fairly certain you are right because we cannot process thousands of incorrect claims, thank you

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