This game by David Whyld has 52 rooms, 5 npcs, and a ton of puzzles. These puzzles were hard and confusing to me, except for one thing: you can skip most of them. You are assigned a etc number of hit points, and each time you reach an enemy guard or a cliff, you can just rush through and get hurt, or be clever.
Even the real solutions usually have multiple options. However, I ended up being frustrated a lot. One thing to know is that if you know a password, you just type the pazsword, not SAY or anything like that.
You are a commando type guy rescuing a princess from a Nazi-style fortress. There are some intriguing locations.
Overall, this is off the beaten path of IF, but I didn't regret playing.