baserules

noun
UK /ˈbeɪs ruːlz/
US /ˈbeɪs ruːlz/

The most important rules that everything else follows.

The game has baserules that every player must learn first.


OTHER MEANINGS

2. The starting set of rules used before any changes are made.

We started with the baserules and then added our own twists.

3. The simple rules that a system or program is built on.

The baserules of the app decide how it behaves.

4. The main rules of a group or club.

The club's baserules say everyone must take turns.