Katana ZERO - Psychotherapy - Secret boss fight

This video shows the boss fight against the psychiatrist that triggers the achievement "psychotherapy" upon completion: defeat the psychiatrist's final form.

Here are the triggers that might help you provoke this fight:
First mission/tape of the game, hang up the phone at least five times during your first call. From then on, always hang up when the psychiatrist calls.
Hotel Mission/tape, let the target commit suicide. Kill the cop on the way out.
Nightclub mission/tape, hang up before going to see the DJ, talk to the DJ, then later tell the psychiatrist that you talked to the DJ. Keep refusing treatment until the psychiatrist gives up on giving you the drug for your next mission. This is the only time when you should not constantly cut the conversation short - all other conversations with the psychiatrist, before and after this seance, keep cutting him short (red dialog prompt).
Prison mission/tape, kill the cops on your way out
Some people say that you should avoid triggering the traps during the Slaughterhouse tape/mission, but I doubt it. In any case, you can avoid the traps whenever there is a big screen: there are motions detectors on the ceiling, and you can dodge-roll past them.
Mission/tape 10 Bunker the psychiatrist will regret that you were not dead already.
Mission/tape 11 Bunker Pt2 the fight should occur. It's a great boss fight, enjoy!

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Katana ZERO is a cyberpunk action platformer in the vein of Hotline Miami developed by Askiisoft and published by Devolver Digital.
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