In these 10 pages you get new races, new optional classes, a new mechanics for resolving thief skills and new monsters.
Yep, there's a lot crammed into the 10 pages.
While I think some of the new races are a bit more powerful then the four core, limiting them to the core classes and treating their race as an optional class for advancement purposes would balance it just fine.
The new classes are fun and the new monsters are just asking to be used. I can never have enough monsters (and I owe one for this week here at The Tavern)
The Minotaur for Old-School Essentials
*Requirements:* Minimum STR 9, Minimum CON 9
*Prime Requisite:* STR and CON
*Hit Dice:* 1d10
*Maximum Level:* 8
*Armor:* Leather, including shield...