Let's take kazakh language as an example. In every source I've read there are 7 cases in kazakh language:
- nominative úı - a house, laq - goatling;
- genitive úı-diń - of a house, laq-tiń - of a goatling;
- dative úı-ge - (in)to a house, laq-qa - to a goatling;
- accusative úı-di - a house, laq-ti - a goatling;
- locative úı-de - in a house, laq-ta - by a goatling;
- ablative úı-den - from a house, laq-tan - from a goatling;
- intrumental úı-men - with a house, laq-pen - with a goatling.
But I could distinguish at least 3 more cases:
- abessive úı-siz - without a house, laq-siz - without a goatling
- essive úı-she - as a house, laq-sha - as a goatling
- comparative úı-dei - like a house, laq-tai - like a goatling
Are these 3 more can be considered as grammatical cases?
There are similar cases in turkish language:
İlgisizlik Hali (abessive) bahçe-siz "without garden"
Eşitlik Hali (essive) bahçe-ce "as a garden"