Thanks, I understand.
My problem is how to measure the Y-distance traveled at every tick. (you mentioned to use an event like jumping or falling, that is not what I have in mind)
every tick: store Y into variable1.
every tick: store Y into variable2.
If variable1>variable2 (meaning: object is moving upwards): add (variable1-variable2) to VariableTraveled.
Result: variable1 and variable2 were always the same. VariableTraveled remained 0.
As in the game doodle jumper: how far have you traveled upwards?
Or: During a level a balloon (platform behaviour, no bullet behaviour) gradually moves upwards and I want to display how many meters the balloon has traveled.
I expected: every change in Y-movement