In the Japanese version, this stage takes place in Kumamoto Prefecture. In the Taiwanese version, stage 4 is set in China and Thailand appears as the previous stage.
Thailand's base is Wat Phra Kaew, the most sacred Buddhist temple in Thailand.
Kumamoto Prefecture's base is Mount Aso, the largest volcano in Japan.
Prior to version 11.7, there were 8 extra Those Guys which spawned after bringing the enemy base down to 50% HP, with a delay of 1-4 seconds between each of Those Guys.