Riverhill Soft's 1986 sci-fi adventure Aggres launches on Switch

D4 Enterprise released the 1986 PC-8801 adventure game Aggres on the Nintendo Switch today. The title is available on the eShop as the latest entry in the EGGCONSOLE lineup, bringing Riverhill Soft's retro sci-fi mystery to modern hardware.

Aggres is a direct sequel to Riverhill Soft's earlier game Zodiac. The story follows a young man searching for his missing father, a prominent space archaeologist named Dr. Duma who vanished during a research expedition five years prior.

The protagonist operates a cargo transport business alongside an antique-loving robot partner named Amaroid Marie. Their search for answers revolves around the Blue Crystal, an artifact tied to Dr. Duma's research. The plot kicks off when they learn that Jason Canac, the doctor's former assistant who fled with his research data, has resurfaced as the director of the local City Library.

Command selection

The game uses a menu-driven interface typical of mid-1980s Japanese adventure titles. Players navigate a list of verbs and subjects to interact with the environment, talk to NPCs, and manage inventory items.

Visuals are presented in the classic PC-8801 aesthetic, featuring sharp pixel art and static character portraits. The launch trailer shows off a variety of locations, from a quiet bar with a fully stocked counter to outdoor city streets. Character designs lean heavily into 1980s sci-fi tropes, including an eerie green-skinned alien and the green-haired librarian Canac.

The EGGCONSOLE release retains the original Japanese text and interface layout. You spend most of your time reading dialogue boxes and selecting commands to push the narrative forward. The protagonist's robot partner provides frequent commentary on your decisions, an early reminder that video game companions have always had opinions about how you do your job.

D4 Enterprise's emulation wrapper includes standard features like save states, but this specific release doesn't have a scene select function. The developers also noted that USB keyboard support on the Switch is restricted to certain Japanese layouts. Anyone hoping to type their way through the menus with a standard US keyboard won't have much luck and will need to stick to the controller.

Before the murder mysteries

Riverhill Soft is best known for the J.B. Harold series of hardboiled detective games, which began with Murder Club later in 1986. Aggres represents the studio's transitional period. They were moving away from early action games toward the menu-driven narrative framework that would define their most successful titles.

The original game saw ports to the FM-7 and PC-9801, but the Switch release specifically emulates the PC-8801 version. It's available on the Japanese Nintendo eShop for 880 yen.

The EGGCONSOLE project has been steadily bringing Japanese home computer games to the Switch over the last few years, focusing on exact replication rather than modernization. Since Aggres never received an official English localization, the text is entirely in Japanese. It's a straight port of a 40-year-old mystery game, which narrows the audience to people who already know exactly what they are buying. For that specific group, it is another piece of 1980s computer history playable on a handheld.