This movie is really old I am guessing 70's, 80's and is not jumanji.

It is a normal movie, then the main character, a boy gets sucked into a board game. After he is sucked into the game, the movie becomes claymation.

I remember little pieces:

- the beginning he was riding a bike
- After he was clay, there was a car he was in and I believe he went into a pinball machine.

Wow. I don't know the name of the movie. But you did help me realize something. Vague descriptions of some movies make me wonder how many filmmakers are on acid when they make the films. The movie actually sounds interesting from it being claymation. :)