Here's a little mapping tool we made using Google Sheets. It does simple and fast dungeon mapping, and its dead simple to print or create a PDF

Try it out: dungeon map template

Instructions: This is designed for keyboard navigation between cells using arrow buttons. You can quickly move along the map, placing tunnels, etc.

• use Space to “tunnel” out hallways and rooms
• use Delete to fill in back to “rock/wall”
• to label rooms and passages start with a space, such as “ R1” for room 1
• doors are made with D, L, S respectively for Door, Locked door, Secret door
• make stairs using “ ==” for top of stair, and “ =” for bottom of stair