Unlocking extra level, boss Remedy

A quick guide to help you unlock extra levels

How to:

Make sure you follow the things below. That's all you need to do:

• Finish the game once on any difficulty
  
• Play a 2nd time on normal difficulty or higher
  
• Turn ''autobomb'' off
  
• Do NOT bomb until you beat stage 4 mid-boss
  
• No continues
  
• NMNB stage 2 midboss
  
• NMNB both stage 3 midboss fights

If all of this is done right, Remedy will appear on stage 4 as a mid-boss. You must defeat her without: dying, bombing or running out of time. When that is done, the stage EX will unlock.

Notes:
* Dying is allowed.
** You do more damage when you are close to the enemy.

Afterword:

If you have questions regarding this guide or just got something to say, leave me a comment below.

[OJ191]

Pretty sure bombing is fine, outside the specified circumstances. (And autobomb off)

These are the conditions as per Reiko guide which I don't recall having any issues with when I followed them.

Play on Normal difficulty or higher.
Auto Bomb must be turned off.
At no point may continues be used.
Defeat the stage 2 and 3 mid-bosses without dying and without bombing.
If you made it this far, Remedy, the 6th stage end-boss, will challenge you to a duel in the middle of stage 4. She has two attack phases, both of which share the one life bar. This battle is relatively easy. Again, you must defeat her without dying or bombing.
Continue on and complete stage 5. Remember that using continues is a deal-breaker.
If you did all of the above, you will advance to the extra stage. During the extra stage, no continues can be used. Running out of lives will cause an instant game over.