Softdisk Publishing released Rescue Rover in the year 1991; it's an old puzzle game, part of the Rescue Rover series.
Rescue Rover is abandonware, runs on DOS and can be played in single player mode.
It's available for download.
Facts, trivia and collector's notes are licensed under the GNU Free Documentation License. These texts use material from this Wikipedia article.
Each level starts with Roger climbing up a ladder set into the floor, and the player completes the level by arriving back at this ladder with Rover - at which point Roger climbs down with Rover.
players: single player
Abandonware DOS popularity: very low