Hi there,
I've come to the "Gordon and Bennet's Dilemma" and it tells me about this jet pack upgrade.
I buy it in the shop but it doesn't seem to change much from before if I press Left Shift...
What am I doing wrong?

Thanks

I was a little confused at first, too, but I think it basically just lets you fly a little higher and farther. Also, if you keep the jetpack button held down when you are descending, you descend a little more slowly than you do without the upgrade. This helps when, in the case of that level, you need to cross the channel. Just use the jetpack like normal, give yourself a boost (is it called nitro?), and you should make it. (Though if I remember correctly, I always fell a little short, but the jetpack helped me kind of skip across the water until I made it to land.)

It barely improves your jetpack performance.

The improvement is enough to help with coasting, but not enough to make it extra useful.