Sci-fi like Mario game, Boy in yellow shirt goes through forest to save a girl

[vixx157]

I played this game in early 00s as a kid, so it should be from 90s or 00s on Windows.
It starts of in a forest, boy with brown hair in a yellow/orange shirt jumps around forest and collects letters, in the very beginning there are 2 pigs you have to jump over. I also think there was a rainbow or something in background when you start playing.
And the main goal was to save his sister/girlfriend.
Also you can find passages to go underground, there are waterfals to go behind or over and portals. I think you could also collect money/diamonds. And there are these portals that unlock and let you go to another setting. I think there was setting like pyramids but i never got there since i never had the full version of a game

[rodrigohc86]

I think it's "Bud Redhead".