Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_4 (genre VARCHAR, type VARCHAR, developer_s_ VARCHAR)
### Question:
What type of 3D game did Valve Corporation release?
### Answer:
SELECT genre FROM table_name_4 WHERE type = "3d" AND developer_s_ = "valve corporation"