This game was added to the Sandpit for the following reason: Incomplete
The game appears to be unfinished, or is a demo of a longer work which has not yet been completed. Once the game has been completely written, it may be re-categorised.
Grade separation is the name given to a method of aligning a junction of two or more surface transport axes at different heights (grades) so that they will not disrupt the traffic flow on other transit routes when they cross each other. The composition of such transport axes does not have to be uniform; it can consist of a mixture of roads, footpaths, railways, canals, or airport runways. Bridges (or overpasses or flyovers), tunnels (or underpasses), or a combination of both can be built at a junction to achieve the needed grade separation.
Legacy Player: The "Play online" link above uses the new Quest Viva WebPlayer, which is currently in Beta. In case of issues,
you can try the old WebPlayer.