To be brief, this GOG version of Dragons Lair 1 has a game breaking bug that happens every time I play this version of the game. There is one scene with a simple passage to the right. you make the correct move, and it shows you exit correctly, then the screen flashes, and then plays the cave-in death animation for that scene, and the game won't let you progress any further. Both Dragons Lair 1 and Dragons Lair 2 seem to become faster and faster the more time you spend playing the game. This only happens in the GOG version. I would honestly suggest buying the Steam version of this game instead, as this one has bugs that will likely never be patched.