Finnish has 16, Estonian 14. Though most inflections can be derived via suffixes from about 4 of them (3 singular, 1 plural), What's probably complicated is when to use the correct form.
01. Paralysis 02. No Worship 03. Made Indivisible 04. Escuela 05. It Never Happened 06. Action Needs Action 07. What You Buy 08. Intention 09. It's All The Same 10. Kneel 11. It's All Good