Overall, I'm not a big fan of dungeon tiles. Dollar for dollar, I find poster maps to be the best quality encounter accessory we can get. That said, poster maps don't include the flexibility we often want when designing our encounters. Dungeon tiles fit this role much better. Recently, I found two accessories that greatly improve the utility of dungeon tiles, the toolbox liner (originally mentioned by Mike Mearls), and the acrylic sheet, a tool just as useful for poster maps as it is for tiles. Below is a video I shot on how to use these two tools to make your game even better.