(4.5.9) Creating a 'thwomp' type of enemy (arcade platformer game)

[gamed000d]

I would like know how to create an enemy that is on the ceiling and falls down on top of the player as they walk under it, crushing them. The classic example of this is Thwomp from SMB3. Another example of this was the spike crushers in Mega Man 2 (metal man stage) and in Double Dragon 2. I imagine it requires the character to step on the tile and it triggers the enemy falling on top of them. Has anyone thought of making something like this?

 

[Moonlight Magic]

In the 13 Bytes of October series, day 7 shows how to make a monster that detects the player's position and then drops when the player gets close. I haven't personally tried it, but this video should give you some ideas for your monster.

View: https://www.youtube.com/watch?v=fXL-c0hp2e0