Is it permitted to play with playdough on Shabbat?

Greetings,

It is forbidden to play with playdough on Shabbat, because this involves the prohibition of smoothing, when one evens out the surface of the material and makes it smooth, and sometimes it also involves the labor of building or writing.

Sources: Orchot Shabbat, part 1 (chapter 17, section 25 and the note there). See also Responsa Be’er Moshe, part 6 (siman 34), and Shmirat Shabbat KeHilchatah, part 1 (chapter 16, section 13).

With blessings,

Hillel Meirs