3x3 Sliding Puzzle

This prefab, available here, really shows the capabilities of mapping on the Source engine. The puzzle randomly shuffles itself 50 steps (without bouncing the same piece) on map spawn. Once the puzzle is completed, the missing piece is shown.

  1 logic_auto
  1 logic_relay
  4 math_counter
  9 filter_activator_name
  9 func_brush
  9 func_button
 15 logic_compare
 11 logic_case
 24 func_train
 24 logic_branch
 32 trigger_multiple
 48 path_corner
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187 entities

After editing the puzzle in large scale, it was made into a prefab and created in the desired location using the Block Tool in bounds of 11x32x32.