Why don't you just make it a sprite that moves like a bag like Joeb said?? Like a background picture? (This is sorta what Joeb said)

Joe, it's a lot more complicated than you may think. The original poster requested being able to "build onto" platforms. This would imply not just one brick, but perhaps a whole wall of bricks, each on top of the other, riding on the moving platform. Problems:

1) Tiles don't move. So I'd have to add new "wall tile" sprites, of every conceivable graphic, as a sprite, and program all monsters / Jack / etc. to treat them as normal walls.

2) The "building on top" of each other element would be very hard. When the platform moves, the brick riding on it would have to detect that it's on a moving platform, and therefore offset itself accordingly. BUT -- so does the brick "on top" of this brick! And so on.

There are plenty of other potential problems. For instance, a moving platform should turn around if the bricks "built onto" it hit a wall, even if the platform itself hit nothing. That would be really hard!

And from experience, I know that there are probably other problems I haven't even considered that I would discover once I tried to implement somethign like this.

BTW, the game is done in straight C, not C++, so there are no objects. I wish it were in C++... that would've made a lot of things easier. But I didn't learn object-oriented programming until I was nearly finished with the game.