XCOM Enemy Unknown’s tutorial mission is secretly rigged. The alien movements, shot percentages, and mission outcomes in the first two tutorial missions are scripted to produce specific outcomes regardless of player choices — the cover system works better than it would in a real mission, enemy HP is reduced, and certain shots that would miss under normal RNG are hardcoded to hit.
Players who suspected this discovered it by saving and reloading tutorial missions and comparing results. The exact same sequence of inputs produced identical outcomes regardless of reloads — indicating the outcomes were not RNG-generated but scripted.
Firaxis built this to prevent players from hitting XCOM’s characteristic difficulty wall in the first twenty minutes and abandoning the game before understanding its mechanics. The tutorial teaches the game’s vocabulary using a rigged experience, then withdraws the rigging once the vocabulary is established.
This has a downstream effect that the tutorial cannot warn about: players who learned the game through the scripted tutorial sometimes believe the real game is less fair than it is, because their benchmark for acceptable shot probability was calibrated against outcomes that were not actually probabilistic.

This is exactly why I love this game. So many layers underneath the surface if you just take the time to look.
Stumbled across this on a late-night session and couldn’t believe it. Your explanation finally made it click.