While Valve Corporation has not officially commented on the Portal Excursion Funnel Glitch, some developers have shared their insights on the topic. According to a developer who wished to remain anonymous, "The glitch is likely a result of a complex interplay between the game's physics engine and the portal gun's behavior. It's a fascinating example of how even the most seemingly straightforward code can lead to unexpected and intriguing outcomes."
The excursion funnel glitch is a cornerstone of Portal 2 any% speedruns. Its most famous use is in Chapter 9, where runners use CFG to fly out of bounds and touch "level change triggers" hidden in the ceiling, skipping entire sections of the final chapter. portal excursion funnel glitch