At the end of each level, a boss (video games) will appear which needs to be defeated to progress to the next level.

This is where the first real boss appears, Apocalymon.

However, bosses appear from the start in some levels, so hearts do not always need to be collected.

I remember the day my boss appeared holding his natural teeth.

When the player reaches the end of a zone, a boss appears, which must be defeated to proceed.

And though they were never fully organized in any formal sense, bosses had appeared to make the attempt.

Vlado has just started poking around inside when the boss appears.

"Good morning," Flanders said, looking up as the door opened and his boss appeared.

Often, when all common aliens are defeated, a boss will appear.

A boss appears at the end of each stage.