Actually Construct's physics are affected by randomness. Just try different times the same layout and object will react differently. Please fix this as we can't make real physics puzzles, because they'll be affected by randomness.
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Yeah, we need a new physics mode - fixed framerate. At the moment it is dependent on a high resolution timer timing the exact differences between each frame, which varies every time you run, so it has differences each time. Fixed framerate physics should fix that, I'll try adding for 0.9.