Border zone is stressful for me. Unlike most IF, you have to type very fast, as the clock keeps running and running. I had to type super fast on the iPad and I kept dying from typos, even using slow time and the walkthrough.
The story and puzzles are actually really fun. I enjoyed the game a lot, especially the first act (where you have to smuggle information out of a train) and the third act (where you are a double agent, and have to stop an assassination without people knowing you did it). The three acts can be started at any time, and each follows a different person.
Stressful, but rewarding.