Like others have mentioned, when you get a set of cardboard pawns for a game system, often there are to few bases to go around. Use this base for 25mm cardboard cutout figures.
This is a base I created in 15 minutes using DesignSpark software to show off our ability (shout out to all you our there!) to produce a replica of an existing base. I used my trusty digital calipers, took some measurements of the cardboard pawns, and produced what you see. Using DesignSpark I was able to round most of the corners, thus the name 'smooth' in the tile.
Used my TOM. Printed the red ones .30 mm height with 20% infill, 1 shell, no support. The black ones I don't recall what the settings were.