Clarity

consistency

engagement

simplicity

utility

use features that retain the interest of

the intended player audience in the game

know the kind of fun the game must

create in the intended player audience

add minimum features that

meet the goal of the game

use one type of approach

in the game

provide flexibility for

future modifications

1) engagement

2) clarity, consistency, simplicity

3) consistency

4) clarity, consistency, simplicity

Explanation:

The answers of the four parts are as mentioned above.

If the game is engaging the interest of the interested players will be retained certainly.

If it is clear, consistent and simple, then you will definitely be able to retain the kind of fun the game will be creating in the intended player audiences.

If its consistent, then the game will certainly require one type of approach.

And if its clear, consistent and simple then the game will be providing the flexibility for the future modification.

Hence the above answer.