To get the multiplier, get the target result. You can view it by using Select. Try the achieve the maximum time. For health and soul, after defeating the Boss, quickly press Start and use health and soul item to get full. If you get the all targets
closely, you will get something like 3x for the experience multiplier. Note: You can pass the target for special monster, health and soul, but you cannot pass or get less than the level time and Boss time.