1 Behind Enemy Lines - Commandos

Behind enemy lines, that is all a commando can ask: to make the right noise in the right place, then melt away before the world notices the difference.

Set during World War II, the game places you in command of a small, elite unit of British Commandos. You are not a general; you are a ghost. Each mission—from the scorched sands of North Africa to the frozen forts of Norway—presents an impossibly fortified Nazi stronghold. Your goal is rarely to kill everyone. Instead, you must sabotage a cannon, steal secret documents, kidnap a general, or destroy a fuel dump. commandos 1 behind enemy lines

The core of Commandos 1 revolved around the "Vision Cone." By right-clicking a German soldier, you could see exactly what they saw. The dark green area was their peripheral vision (where you could crawl safely), and the light green area was their direct line of sight (where you’d be shot on sight). Behind enemy lines, that is all a commando