The Super Star Foraging Toy makes a great entry level foraging toy, small enough to be used with smaller rodents such as mice, but could also be used with rats.
The see through design allows them to see the reward inside. Once full, hang the toy up in the cage; if it is placed near a perch it makes it easier, or hang it up high and away from perches to make it more challenging.
The star shaped lid can easily be lifted or pushed aside by your pet so they can retrieve their goodies.