Knife Wonder Ninja

Without any buy in the game
Just throw the knives and kunai into the logs to break them, like a maven Ninja.
Slash the Pineapples and get new knives unlocked. A boss defends every 5th stage-beat them to get special knives or kunai!
Be careful to not hit other swords and knifes, or you will lose, and do not waste knives in vain.
Time your actions, goal carefully and become the knife ninja boss
Can you win all challenges and take all knives from bosses?
Show us how you can build your knives arsenal!!