Yeaaah, I got it.
Click the grey lid.
Click the yellow arrow.
Shoot first stone horizontal.
Open up the yellow-ish window.
Shoot second stone upwards. (so you hit the bell)
Move the red arrow so it points to the right.
Destroy the grenade.
- When you click the bridge, it will hop. Fire the grenade horizontally - and when it's about to land on the bridge make it hop. The grenade will be launched into mid-air and explode.
Do the same thing with the other grenade.
Don't change the firing position of the cannon, and shoot the blue thing.
The gate is now open.
Click the guy standing by the cannon. (he will now be dropped into the cannon)
Click the yellow arrow. (a new guy will appear)
Shoot the cannon upwards.
- You can wiggle the spear by clicking it, make sure the guy doesn't get killed by the spear by wiggling it just before he'll fly over it.
Click the guy. (the belltower is now moved to the left)
Click the bell a few times. (the grenade is blown up)
Click the door. (there's now someone behind the blue window)
Click the guy in the cave, a dog will come after him.
- If you click the window something comes dropping down. Time this right - so it falls on the dog.
You're done.