[2] The game is set on the planet Blabgor and centred on the exploits of Gribbly Grobbly and his attempts to rescue errant 'gribblets' from the landscape and return them to safety.
'Gribblets' are infant Blabgorians; they have an armoured shell to protect them, but when flipped on their backs they expose their vulnerable belly and are unable to right themselves.
Blabgor however is not a safe place; there are hordes of beasts roaming the landscape, eagerly searching for vulnerable Gribblets.
The basic premise for the game requires the player to control Gribbly and navigate him through each of the 16 surreal 8-way scrolling landscapes in an attempt to locate and rescue eight baby Gribblets and returning them to the safety of the home cave.
Seven years after its release Gribbly's Day Out featured as the theme to a secret level found in the 1992 Amiga game Fire and Ice also designed by Andrew Braybrook.