The end of the tunnel

The end of the tunnel drops you into a steadily shrinking passage packed with obstacles, and the whole challenge is reacting fast enough to navigate through it and reach the light waiting at the very end. Because the tunnel keeps closing in as you progress, the margin for a mistimed move shrinks along with it, so a reaction that would have been perfectly safe earlier in a run can become a collision later on simply because there is less room left to correct course. Reading an obstacle's position slightly ahead of when you actually need to react to it, rather than waiting until it is directly in front of you, buys the extra fraction of a second the shrinking tunnel keeps taking away. It is a fast-paced reflex challenge that gets tenser the closer you get to that light at the end.