All I know is it was suppose to be a mechanic where you found the eggs in BK1, removed the BK1 cartridge while the console was still on, plugged in BK2 and the eggs would unlocked stuff.

Thing is with cartridges if you remove them while the console is still on you just end up freezing the game, and probably ruining your cartridge. The mechanic probably would have worked better if they went with a CD format instead of cartridges.

Or they could have done something like Sonic 3 & Knuckles where you could physically plug the two games together.

Anyway it was one big cluster fuck, like just about everything else in the series history. From the way the video portrays their development it’s a miracle they even came out. Lucky they did as BK1 & 2 are some of the best games on the N64. I still have my copies and after watching the video I feel like playing them again.

I think I heard the Stop & Swap was finally implemented successfully when the two games were put on the Xbox Live Arcade.