Players can easily get bored from doing the same thing again and again and again. So designers are always trying to let player feel different and fresh when playing their games. One way to do this is to mix several set of game rule into one game, and arrange them well through level design. If this goes well, player would constantly feel they are getting new experience and never feel bored.
1. Batman: Arkham Asylum Edit
In Batman: Arkham Asylum, Player are constantly needs to face 3 kinds of challenges: battling, sneaking and puzzle solving. When I play this game, I never feel tried because these mode alternate in a perfect pace. Just when I about to feel boring from controlling batman to battle enemies, the next scene change from battling to sneaking. Or when I was controlling batman chasing clue, several gangs will appear and change game to battle mode. The game design is so good that these switchs are very smooth and I can hardly feel any glitch.
2. Saints Row IV Edit
In Saints Row IV after learning that Johnny Gat may still be alive, the player is given a mission to rescue him. The player is then put into a two-dimensional side scroller which provides him/her a vintage arcade experience different from the regular experience of playing Saints Row.