All or Nothing was developed by Paul Reynolds for the ZX Spectrum and released in 1984 by Abbex.
The basic premise of All or Nothing sees the player parachute into hostile territory, retrieve secret documents and destroy the enemy camp. The game is essentially an arcade style action game that also combined elements of strategy. The game has an isometric display that utilises four cameras, meaning that if your character is obscured by an object, the camera will change automatically to keep the player in view.
The mission in All or Nothing is to retrieve some secret files contained in the enemy camp and escape, all within a limited timescale. The player must initially find his watch that has been lost in the parachute jump in order to keep track of the remaining time, after which a transmitter may be used to request more time if necessary. While searching for the hidden documents, the player must gain access into a series of warehouses, some of which house keys that then allow access to other locations. This is done by cracking a safe code in the warehouse office; cracking the safe will reward the player with a key, which can then be used to gain access to the next warehouse. As well as housing the hidden documents the player is searching for, these buildings contain supplies such as money, ammunition and explosives.
Enemies in All or Nothing come in the form of patrol dogs and armed guards. The latter can be bribed with money found while exploring to temporarily allow the player greater freedom, and also be distracted with explosions. Gas canisters can also be used to incapacitate guards, whereupon their bodies may be searched; as with bribing, ID cards found on the disabled guards allow a limited period of immunity.
Source: Wikipedia, "All or Nothing (video game)", available under the CC-BY-SA License.