Rachet and clank 3 probs?

my little bro has been playin rachet and clank 3 alot l8ly and has decovered that u carnt fin it. he can get up to the 5th mini game thing and then it wont load the 5th thing. i was wonderin if this can b fixed or skiped and i dont want to have to spend any money but if thats the only way plz tell