CREATE TABLE table_6612 ("Title" TEXT, "Year" FLOAT, "Platform ( s ) " TEXT, "Director" TEXT, "Producer" TEXT)

What platform was used for the game directed by Bryan Walker after 2006?
SELECT "Platform(s)" FROM table_6612 WHERE "Year" > '2006' AND "Director" = 'bryan walker'
SELECT "Platform(s)" FROM "table_6612" WHERE "Director" = 'bryan walker' AND "Year" > '2006'