Protect Farthy's snacks was a mission that Jak and Daxter completed to obtain a power cell in The Precursor Legacy. Right after Jak rode the flut flut he came across Boggy Billy whose pet hip hog Farthy had been scared away by lurkers. Jak had to protect his snacks from swamp rats so Farthy would come back home.
The PlayStation 3 and Vita versions of this mission are related to a trophy named "Hungry?", completing this mission will reward you with a bronze trophy. The Vita version of this trophy requires using only the touchscreen.
Accept the mission to begin this minigame. You'll then be in a fixed place with first person view on, you're only able to move it from left to right as well. The fixed position you're in is directly located on top of a bit of yellow eco, which instantly respawns right when your own charge runs out, meaning you can endlessly shoot fireballs.
Billy has placed five pieces of Farthy's food in front of you, which attracts the rats. They'll come in three waves, with more rats in each wave. The yellow eco fireballs automatically travel forwards and will strike any rat they come into contact with. If a rat eats one snack you will lose and will ask "Do you want to play again?" After the last rat has been killed, Billy awards you with a power cell.