Ruthless | TopScore Electronic Dart Scorer | Digital Dart Board Scoring System for Up to 8 Players, 32 Games, 590 Variations (SC037)
| Country | USA |
| Brand | Hyperion Books for Children |
| Manufacturer | Random House/Disney |
| Binding | Kindle Edition |
| ReleaseDate | 2019-10-01 |
| Format | Kindle eBook |