It turns out that having Kelly play Jak and Daxter with me adds value. Her playing style is by turns novel and frustrating. When she gets stuck, in a non-threatening situation, i.e. no monster lurking or approaching, she will just fiddle with the controller, rather than giving me a turn. I'm treated to endless loops of Jak charging walls with his head. Sometimes he pogos, sometimes he runs in tight little circles. I eventually took to carrying a book downstairs for our gaming sessions, since I was bordering on making irritated comments.
Recently I noticed that she was making Jak do somersaults, something which isn't documented in the instructions, or mentioned in the game. I asked her how she did it, and she didn't know. Eventually I caught what she did, watching while it happened. Once she knew, she added this move to her fiddle repetoire. I had been stuck in one area, unable to make the leap from one pillar to another. So she tried somersault/jumping, and succeeded where I had failed repeatedly. Now we know that this is the way to leap across most pillars. Score one for Kelly!
Now if I could just get her to stop setting me up for a beating. She never wants to fight monsters, but too often, she'll wait until they are nearly on top of her, then throw the controller at me, forcing me to take vital seconds just getting my hands on the controller buttons (and often toggling off zoom or some other obscuring mode she has triggered accidentally while flinging the controller at me). By the time I'm ready, I've already gotten slapped a couple of times. Oog!