This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The flat surface of a table.

adj. Made or designed for use on the top of a table: a tabletop copier; tabletop art.

n. the flat, horizontal surface of a table

n. A fixed item resembling a table, used for performing skateboarding tricks.

adj. Designed to be used on the top of a table

adj. Compact enough that it theoretically could be used on top of a table

n. the top horizontal work surface of a table

"I have to deal with this sort of nonsense in tabletop RPGs and other hobby games."

work surface   

countertop   

countertop    desktop    statuette    windowsill    blackboard    figurine    ashtray    sill    dais    bookshelf