Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_4 (genre VARCHAR, type VARCHAR, developer_s_ VARCHAR)

### Question ###
What type of 3D game did Valve Corporation release?

### Accurate SQL ###

SELECT genre FROM table_name_4 WHERE type = "3d" AND developer_s_ = "valve corporation"