I encountered the following glitch while playing Okami earlier today:

I just defeated 99 enemies during the 10 rounds of the Ryoshima Coast Devil Gate and now the final Black Imp will not take any damage or attack me.

I have used several different types of attacks, including different equipment, Celestial Brush attacks, and damage scrolls. Nothing inflicts any damage on the enemy.

This is a pretty serious and annoying glitch as I just spent the last 15-20 minutes fighting enemies with the purpose of clearing this Devil Gate Trial. What’s even more frustrating is that I didn’t save immediately before the Trial. (I couldn’t imagine encountering a glitch like this.)

Source: Ryoshima Coast Devil Gate Trial glitch: Final Black Imp invulnerable in round 10

Click past the break for video footage of the glitch.