Your ninja skills and abilities are the key to your success. If you want to beat the bosses at the end of level 50 with NO problem, make it a priority to purchase the skill "Drop 3". If you have Drop 3 and you are fighting the final bosses, or anyone else for that matter, here's what you do:
1. Get some distance on your enemy and press and hold attack.
2. Then get close, while locked on and standing (not crouching).
3. Release attack and you will grab the enemy and slam him on his head. Now while he's down, recharge your attack, wait for him to stand up ... and release. It's that easy! Not a single enemy in the game is any match for this skill.
Another great ninja strategy is something I like to call the Badger Kill. If you have unlocked the skill "Badger 1", don't be fooled by it's low level version, it's actually a very effective way to not only escape detection, but to perform high-speed stealth kills. At any point between the start of the run, to the point you start skidding to a stop, you can grab an unaware enemy by pressing attack just as you run into them. Don't be afraid of alerting him/her, they won't be able to react in time. (Your sword must be drawn). You can also line up the badger by clicking the right joystick and going into look mode.
You may have realized that achieving situational stealth kills is rather difficult when you can't exactly time your attacks quite right; leading to disaster. A simple way to solve this problem is to merely knock out an enemy, draw your sword, and perform one with minimal effort. Oh, and do be sure to avoid killing while exposed; this will NOT work in alarm mode.
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