Oh the joys of King’s Quest V. The most notorius soft lock is one that happens so fast that you would never suspect it to be a soft lock. Early in the game, the player will come across a scene where a cat is chasing a mouse. Now, this should make the player go “OH NO, THE POOR MOUSE!” and help the mouse. However, the scene is tied to your CPU speed so you have a total of 2-4 seconds to go into your inventory, select the item to yeet at the cat, and save the mouse. Many players will blink and just go, “Alright well that happened.” So, the player goes on and finally gets to a point in the game where Graham gets knocked out and tied up in a basement. Yeah your game just ends here if you didn’t save the mouse because the mouse chews through the ropes. THERE IS NO INDICATOR, AT ALL, THAT THE MOUSE IS THE KEY TO SOLVING THE PUZZLE. NONE. And people wonder why LucasArts titles are more fondly beloved over the earlier Sierra titles.
I always forget about the coin because I learned my lesson from all the bullshit one screen items from Space Quest IV as well. Also, I’d like to mention the game that was programmed to never let you get the true ending due to legal issues. I Have No Mouth, and I Must Scream could never be truly beaten for the best ending in the French and German releases. Mainly due to the character Nimdok’s storyline being entirely centered around Nazis and the surgical “experiments” that happened. I’m not here to dwell on that, but what I am here to dwell on is that when the game was released, French and German players could not get the true ending due to CyberDreams forgetting to check off the trigger for Nimdok succeeding in his game. So, the game was always in its fail state up until 2013 or so when it was finally released on Steam and GOG. The game was in an unwinnable state for those releases for almost 20 years. No revised version with a fix was ever issued until the worldwide release.