Iv'e been trying to simulate a hot air balloon for a while, could never do it. Tragic as is, I played a game that had exactly what I was trying to solve, someone beat me to it, gosh dangit!
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Hmm, maybe with the Sine behavior? It can move the balloon left/right continuously and then just move it upwards (-y) or use 8 direction behavior to move it.
I made a small tutorial for snowflakes with sine behavior here: https://www.scirra.com/tutorials/767/an ... e-behavior
It may work for balloons flying upwards too.
Thx Bl4ckSh33p I can work with this!