You can create a Cost per Play Challenge in two ways: via a template in the challenge templates, and as a new empty Challenge from the New challenge menu.
The cost per play is calculated from the purchase cost and the number of plays of each game. Plays that are set to have been played with someone else’s copy are not counted. Any currency you have set in the purchase cost is not taken into account.
There are currently no variants for the Cost per hour or Cost per player etc.
Creating a Cost per play Challenge via the template
The Cost per Play template creates a Cost per play challenge with all your owned games added. Games that do not have purchase costs are ignored, until you set the purchase cost later.
In the template you can choose between several target Costs per play, ranging from 0,50 to 7,50 (or 0.50 to 7.50). This is the target value for each separate game in the challenge. To complete the challenge, get every game’s Cost per play below this target value.
You can set the challenge period to the current or next year. The challenge runs until the end of the selected year. There is no starting date to the challenge, all previous plays will count as well.
As always, a challenge created using the template can be edited later, you can: add or remove games, change the target value or the challenge period.
Creating an empty Cost per play challenge
You can add an empty Cost per play challenge from new challenge menu: 
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In the this challenge you can add any game you like, not just from your owned games. Games that are added but do not have purchase costs are ignored, until you set the purchase cost later.
You can type a target cost per play, e.g. 3,30 or 6,25 (or if applicable in your country, noted as 3.30 or 6.25). This is the target value for each separate game added in the challenge. To complete the challenge, get every game’s Cost per play below this target value.
You can also set the end date for the challenge. There is no starting date to the challenge, all previous plays will count as well.
Entering purchase costs for a game
The purchase cost of a game can be entered into a copy of that game.
On the Game’s overview screen:
- Tap the Collection status below the box cover
- In the quick collection popup that appears,
- either tap the pencil icon to edit an existing copy,
- or add your first copy by tapping the applicable collection status (e.g. owned),
- then tap the pencil icon.
On the game copy’s detail screen you can enter all kinds of details, including the purchase cost (price paid). You can also select the currency you paid in.
Note: the currency is not taken into account for the Cost per play challenge. You can set a purchase cost of 0 to e.g. denote you got the game for free.