Minefield was written in 1992 for the CoCo 3 by Kenneth Reighard.

This Minesweeper knock off appeared in the November 1992 issue of The Rainbow. You need to clear all the non mine squares in the grid. Higher skill levels include more mines in a larger grid. Use the arrow keys to select a square. You can press the space bar to reveal contents of a square. If there are no mines adjacent to the square, it will be blank. If there are mines adjacent to the square, a number indicating the amount of adjacent mines will be displayed in the square. If it's a mine, you lose. You can use the ENTER key to mark a square that you think contains a mine.

The Easy level is 10*10 (10 mines), Medium is 20*15 (45 mines) and the Hard level is 30*20 (99 mines).

The following attributes can be used to map the evolution of Minesweeper. Blue cells are confirmed attributes for official versions of Minefield. Yellow cells are unknown.