Challenges (formerly Challenge Missions) are a set of single-player educational missions in StarCraft II: Wings of Liberty. Each challenge is roughly 5 to 10 minutes long and teaches an aspect of StarCraft II gameplay. They evaluate and score the player's performance, and even provide tips about how best to tackle them. Achieving the highest score, however, requires strategic prowess. The player can unlock three different achievements per challenge depending on the final score.
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