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In general, you can position yourself on any full cell. All characters start in a hidden state. The default detection range is 12 cells (and here's a reminder that performing aggressive actions or taking damage while in a hidden state will break the stealth). The green area is like a forest, but it doesn't obstruct vision. The gray area is a mountain; you can't shoot through it or see through it, and you can't climb it either. After placement, the turn order is determined by initiative.