GRIDD, Regularly Priced at $11.99, is 10% Off for a Limited Time Only on Steam SAN FRANCISCO, 2017-May-18 — /EPR Retail News/ — Kongregate, a leading publisher of mobile, web, and PC games, today ( May 16, 2017 ) launched their first original title on Steam, GRIDD: Retroenhanced. GRIDD is a fast-paced arcade style shoot ‘em…