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This page provides an overview of the possible applications of classEx on the basis of diverse types of games. These are only some example. Many more games can be found in the repository in classEx.

Game Description

In order to store and search for games the following information provides a definition of a game.

Name A short name which describes the game
Game Structure Individual vs. Strategic Choice (sim, seq or cont)
Roles Number of Roles

Alphabetical List of Games

Find an alphabetical listing of all games featured in this Wiki here.

Standard Games

classEx provides users with a set of ready-made games that come with a classEx account. You can find these in the Overview on the Starting Screen. This provides examples of different applications of classEx and also gives you ready-made games for some of the standard experiments such as the Public Goods Game or the Trust Game.

Categorization of Game Structure

classEx builds on a simple categorization of games. The categorization builds on the structure of the games. It first distinguished between individual and strategic choice. The latter then can be classified into simultaneous, sequential or continous games.

Individual Choice Strategic Choice
Simulataneous Sequential Continuous

Individual Choice

Individual Choice means decisions of individuals which are made alone. No strategic interaction with other participants takes place. In the following, you can see a few examples of Individual Choice games that can be implemented with classEx.

Single Choice

The easiest type of questions are Quiz Questions as they can be also in found in standard Audience Response System. Participants choose among a set of options.

Single Choice with Random Events

Simple questions combined with a random event are a different type of application for Individual Choice games. This way, participants can be animated to think about decisions with unsure outcomes and payoffs. Lecturers can use this to show relevant applications in, for example, statistics, stochastics, finance or the insurance industry. For instance, participants can place a bet on a coin toss. You can also test to which extent participants are willing to take a risk. In the following, you can find a few examples of how random events can be implemented in classEx:

Ellsberg Paradoxon

Lottery and Risk Preference

Search Costs

Single Choice with Treatments

Treatments are a great possibility to expand Individual Choice questions. With these, two (or more) variations of the same game can be played. Participants are divided into two groups of the same size and, for example, see different scenarios for the same game. Each group then plays a different treatment and differences between the two treatments allow for conclusions regarding the impact of different scenarios. To implement this, you need to choose the option “Treatment” in list “Treatments, roles & groups” and specify the number of treatments. It is possible to display different information, so-called private information, on the mobile devices of the two groups. A well-known example for the use of treatments is the “Asian disease” presented by Tversky and Kahnemann (Science 1981) which exemplifies a cognitive bias. Similarly, framing and priming effects can be determined with a game. In the following, you can find a few examples of how treatments can be used in classEx:

Ethical Dilemma


Wage Increase

Multiple Choice

Opinion polls differ from quiz questions in the sense that you cannot classify one answer as correct. Further, it may be possible to choose more than one answer (Multiple Choice).

Effects of inflation

Numeric Data

Decisions of participants can also require an input of numbers. For this, simply choose “Numeric input field” as the type of input field in the Editing Mode. A game that uses this form of input is shown below:

Estimation Task.

With Treatments

You can also implement several treatments in games with numeric input. For example:

Distribution of Income

Strategic Interaction

With classEx, strategic interaction in the lecture can be modelled, too. It offers games which can be conducted simultaneously, sequentially or continously (not yet implemented). Furthermore, the type of the game is determined by the number of roles. Participants can be assigned to different roles Role1.PNG Role2.PNG. Every role is related to a seperate task and interaction.

Simultaneous | 1 Role

In a simple variation with strategic interaction, all participants have the same role and only interact with each other in one big group. Contrary to individual choice games, the result is influenced by the decisions of all other participants in the lecture.


Workplaces in the Library^

Schelling Salience (Faces Beauty Contest)


Common Value Auction

Private Value English Auction

Beauty Contest

Tragedy of the Commons

Public Goods Game, Common-Pool Resource Game or Minimum-Effort Game

Simultaneous | 2 Roles


This sort of game entails standard Matrix Games:

Battle of the Sexes

Chicken Game

Hawk-Dove Game

Stag Hunt

Prisonners Dilemma

Coordination Game

All of these might be carried out with multiple treatments.


Dictator Game

Ultimatum Game with MAO°

Sequential | 2 Roles

Sequential games can be modeled with two or more stages.

In sequential games, one should use the dropdown role filter on the elements in the editor. The final page must have either a result element on the lecturer side or a manual forward button. Automatic forwarding will not work as the two players need to wait of each other before the results can be displayed.



Centipede Game


Labor Contract

Trust Game

Ultimatum Game

Alternating Offer Bargaining

Continuous | 2 Roles

Continuous games are not yet implemented in classEx. This will be done in the near future.

Dutch Auction

Double Auction