As blogged by Unsung, an unnerving glitch in the PS1 Japanese-only game Boku No Natsuyasumi allowed players to progress beyond the limited time period scope of the “peaceful, month-long vacation gameplay”, and…

That had consequences that are not hard to imagine in a game written in a 1990s programming environment: both game data and visual assets were now being interpreted from places in memory that were not prepared for this use.

Good write-up capturing the allure of the game’s unlock-able, but unintentional mystery environment. More of this, please.