File:Earth Warp challenge 11.png

Summary
A screenshot of the eleventh challenge's "easy" version from the BBC Micro version of BBC Enterprises's Longman Logotron-developed 1993 educational game, Earth Warp. (Note: The "hard" version of this challenge is visually identical, but the sand in the top half of the hourglass falls down into its bottom half faster, so the player has less time to complete it.)