The second book is very, very heavy on division and as such it's not really as much 'fun' as the original, however I'd still recommend it! What do you mean by

The second book is very, very heavy on division and as such it's not really as much 'fun' as the original, however I'd still recommend it! What do you mean by this? Did they merely add a ton of information on division? Or did they take out the 'fun' bits from the original and replace them with division stuff?