This game is on Binweevils precisely if you go into Dosh’s Palace and then follow the road towards the left corner.
Mulch shoot game is not too difficult if you can point your mouse cursor right on the target (Mulch Pigeons). Do not see the bullets that fell to your side because it will make your shots a lot of missed and game over soon.
Pull the lever to release the mulch.
Use your mouse to aim the crosshair at mulch as it flies over. Click to fire your blunderbuss. Watch your ammo level.
Score enough and access secret bonus level!
First play, I get to the last level, not bad. Then got some Mulch and Experience (XP). So, keep trying until you mastering this game.