Boku no Natsuyasumi 4

Boku no Natsuyasumi 4: Seitou Shounen Tanteidan "Boku to Himitsu no Chizu" (ぼくのなつやすみ4 瀬戸内少年探偵団「ボクと秘密の地図」) is a video game developed by Millennium Kitchen and published by Sony Computer Entertainment for the PlayStation Portable. It is part of the popular Boku no Natsuyasumi series and was released in Japan on July 2, 2009. Like Boku no Natsuyasumi 2, it takes place in a Japanese coastal village.

Description
The main character spends his summer vacation in a coastal village in Japan. The game contains the familiar bug collecting, beetle fighting, swimming, fishing, morning exercises, and family meals from previous series entries, but also features new activities, such as playing a taiko drum, challenging other children to duels with your mechanical toys, a beetle circus, and several tabletop games. Unlike other games in the series, which take place in the year 1975, this installment takes place in the summer of 1985.

Reception
Popular Japanese review magazine Famitsu rated the game a 31 out of 40 (8/8/8/7).