"I had three friends play this level, and observed how long it took them and what decisions they made. This is my chance to check difficulty level and overall quality of the puzzle. Ultimately, the player needs to feel like they solved the puzzle through some degree of skill, and not through trial and error."
Playtester A: Tried to race the blocks at first and beat the room with sheer speed. When this didn’t work, she took some time to think about what to do. After about 3 minutes and 8 attempts, she figured it out.
Playtester B: “Is this a speed thing?” Tried several times to use speed to outrun the fuse. Got very close on a couple attempts. “It’s so close that it seems like it should be possible.” Beat in about 3 minutes and 10 attempts.
Playtester C: “Oh, I stopped the fire! How did I stop the fire?” after beating the level. About 5 tries and 2 minutes.
Verdict: "Players liked this one pretty well, and it’s easy enough that it could appear early in the campaign. It would be a good way to introduce the concept of fire propagation. The placeholder animations for this aren’t conveying what’s happening well enough though, so they need to make it very obvious when the fire fizzles out."