level 6 is impossible because of where the shelf is levered. no way can you drop anything heavy enough to fire the ball up there that doesn't get in its way in 1 shot.
this is a very poor and much less playable version of cargo bridge. its not explained very well and its not very obvious how to play. cargo bridge is miles more intuitive.
had to quit on level 29 as well. if u buy wrong weapons you are screwed. you need to be able to revisit previous levels to get more moneyor sell weapons you dont want.
finally beat this.
level 1- buy max rockets, go 45 deg full power each jump. fire rockets at max height.
level 2 same. fire rockets 1 after another.
level 3 same & skis if you can afford.
level 4 rockets & skis max & trippy, lower trajectory here.
level 5 same, consider creative.
level 6 same but definately buy creative.
level 7, same but with max gunpowder. very low trajectory but max power.