Valve Corporation เปิดตัวเกม 3D ประเภทใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What type of 3D game did Valve Corporation release?It is not neccessary to use all the tables.
 table_43622:  "Developer(s)" [ text]  "Genre" [ text]  "Type" [ text] 
SELECT "Genre" FROM table_43622 WHERE "Type" = '3d' AND "Developer(s)" = 'valve corporation'