trial-and-error gameplay
In trial-and-error gameplay, the player can be faced with several equally plausible game options, but only one will have a positive outcome, while the other will penalize the player. The only way to win is to try all possible options, and learning from previous penalties.
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Random and trial-and-error gameplay -
23 June 2006.
The use of random and trial-and-error gameplay are among the design choices that can make games unfair. It is still ok to use them, but only in specific situations and in any case, the player must be aware of that and not be taken by surprise.