1-Did you use cheat codes? (using cheats preent you from getting any reward)
2-Sometimes there is a bug, and despite you win you don't get any reward (quite rare, but happened to me once)
3-If you win the challenge and after you load a savegame, you won't get the 4th hand until you switch to the next level. Try playing a level in challenge mode to check if the 4th hand is unlocked. (don't worry normally you can the the 4th hand in the campaign)
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