To provide a toy which continuously monitors positions of a mobile model or variation of the positions and furthermore reports the state when the mobile model does not correctly travel on a route model.

The toy has a location detection means which detects positions or position variation of the mobile model on a base by non-contact in interlock with movement of the mobile model and a notifying means which reports to a player information about correction of errors of positions or position variation on the route model of the mobile model based on detection of positions or position variation of the mobile model by the location detection means.