Alternate title screen:
Complete Survival mode. In the Japanese version, the word "Tatsujin" will appear in Hiragana at the title screen.

Ape Olympic mini-game:
Available for purchase in the Hobby Shop for 1,500 credits.

Cheat Codes for Japanese version:
Press L1 + L2 + R1 + R2 + Start to display the password entry screen. Then, enter one of the following passwords in Hiragana:

Gageru Ape:
Enter "rusarukeka" as a password.

Kuro Sennin Ape:
Enter "kuroihoumonsha" as a password.

SAL-1000 Ape:
Enter "rusagu-boisa" as a password.

Survival mode:
Enter "sabaibaru" as a password. Alternately, capture all apes then catch Specter a second time.

Mesaru Gear mini-game:
Enter "yumenokyouen" as a password. Alternately, successfully complete the game to unlock this item in Hobby Shop for 573 credits. Successfully complete this mini-game to win 1,000 Gaccha Chips and unlock Hard mode. To get the Croc cap and infinite items, rescue all twenty hostages.

Mesaru Gear cast in Movie 28 and two cinema files:
Enter "futarinosune-ku" as a password.

Pigaru Ape:
Enter "futarimenootoko" as a password.

Sarutimate Fighting mini-game:
Available for purchase in the Hobby Shop for 1,500 credits. Successfully complete this mini-game to win 1,000 Gaccha Chips.

Unlock Croc Cap and Infinite Items:
You must rescue all 20 hostages.

Unlock Mesaru Gear:
You can buy this after catching Specter. It costs 573 credits.

Unlock Survival Mode:
You have to make sure you capture all apes and catch Specter a second time.