Select number of questions for single player. Select league match for multiplayer. For multiplayer, both competitors must join the same room.

For single player blitz-mode, the user can select the standard category and the two complex categories. They can also select the weight for the four categories (including multioperation) to be included.

For single player standard-mode, only the weight of multioperation vs. custom questions can be selected.

In both modes, the user can turn off the question timer to allow for more than 30 seconds to answer the question.

Standard mode has four levels: qualification, regular season, playoffs, and finals.

Blitz mode has three levels (no qualification mode).

Qualification or regular season are appropriate beginning points. Playoffs is designed for experienced mental calculators. Finals is for elite-level mental calculators.

Two significant digits for answers between -100 and 100. Otherwise, nearest integer.

The Calculation League app provides question by question results after the session.

As of now, there is no option to create a user account or save data.

You can put in anything you would like., but if someone else is currently using that room or player name, it will not work.

Users can click enter/return to submit an answer. When the submit answer button turns yellow, you have one answer left. When it turns red, you have used all five answers.

The shift key should switch between left to right and right to left typing. If the button is red, you are typing right to left.

Answers that involve typing multiple integers should be answered using simply a space between integers. For example, 1 2 3 4 —- no punctuation.

You can change the colors, size, spacing, and thickness of essentially all of the gameplay elements using the formatting options.