There's crazy golf, then there's crazy golf. Wonderputt is crazy golf. A game that takes an old fashioned mechanic and reinvents it through clever, seamless level design.
Putt Putt games typically work via simple, discrete levels, but Wonderputt gives you a sense of scale by putting all the levels on the screen at once, making you feel as though you're actually progressing through this giant, constantly evolving, insane Putt Putt course. You get a real feeling of progression and reward, almost as though someone has combined crazy golf with the adventure genre.
In that sense it's not really a golf game, it's more like an adventure game that uses the golf/putt putt mechanic as a means of progression.
Wonderputt really is a clever little game.