"Brain Box Games" appears to be a legitimate company that offers educational technology. They provide engaging and challenging games designed to help children grow in confidence and ability. Their offerings include a whole-school spelling programme called Magic Spell and a times tables game called TTGo. They have worked with hundreds of pupils and teachers at BETT Futures, which has helped them build their business in a sustainable and ethical way. However, it's always a good idea to do your own research before using any online service.