The last one in the next Rally King is the real nuisance. If you screw up just once (and it's pretty easy given the way the 3rd course is laid out) you'll probably have to replay the whole thing over again.
I just finished Haggle Man 2 and am now on the RPG. I was really impressed on the effort they took to make Haggle Man 2 feel like real sequel. New rules, better graphics, better music, new items, enemies, larger levels, and other tiny details. I can wait to sit down and play through it once I get done with the challenges. The RPG so far is looking a bit more full fledged than I thought it was going to be. Think somewhere in between Dragon Quest I and II and you'll get an idea.