19 October 2026 · 6 min read
There is a version of a casual mobile game where an ad interrupts you every three rounds whether you want it or not. That version makes more money per player. It also gets one-star reviews from people who were enjoying the game until it started interrupting them.
Candy Mass does not do that. Every ad in the game is opt-in: a player taps a button because they want the thing the ad unlocks. If they never tap it, they never see an ad.
No ad before the player understands the game. Nothing is shown in the first minutes. There is no value in interrupting someone who has not yet decided to stay.
No ad during play. Once a round starts, nothing interrupts it. A round is the only part of the game that asks for uninterrupted attention, and breaking it is the fastest way to make someone stop playing.
Ads only behind a choice. Two places offer an ad. One lets a player continue after running out of lives. One doubles the coins earned at the end of a round. Both are clearly labelled, both are skippable, and both leave the game completely playable if declined.
It is partly a values decision and partly a retention decision, and they happen to agree.
The values part is simple: the game is meant to be calming. An ad that interrupts is the opposite of calming. If the design goal is honest, the monetisation has to fit inside it rather than fighting it.
The retention part is that interruption ads trade long-term play for short-term revenue. A player who watches six forced ads in a session and uninstalls has produced six ad impressions. A player who stays for months produces hundreds. Over any reasonable time horizon the second player is worth more, and the first player is also telling everyone they know that the game is annoying.
Being honest: this leaves money on the table.
A forced interstitial on every third round would multiply impressions several times over. The rewarded-only model captures a small fraction of that. If the only goal were revenue per install in month one, this would be the wrong decision.
The bet is that retention and reputation are worth more than the first month of impressions. That bet might be wrong. It is, at least, a bet made deliberately rather than by accident.
There is also a one-time purchase that removes the optional ads. It exists because some players would rather pay once than be offered a deal they have to keep declining.
The button that offers it stays hidden until the purchase system is live and tested. An offer that fails when tapped is worse than no offer at all.
Rewarded ads convert better than expected when the reward is genuinely useful. The button that lets a player continue after running out of lives gets used because at that moment the player wants something specific and the game is offering exactly it.
That is the whole difference. An interstitial says "stop what you are doing". A rewarded ad says "here is something you wanted, and here is the price". The first is an interruption. The second is a transaction. Players are fine with transactions.
If retention data showed that players who see forced ads stay just as long, this design would be leaving money on the table for no reason and should be reconsidered.
What the data actually shows, in most games, is the opposite: forced ads correlate with churn. Which is why the rule here is short and absolute. No ad that the player did not ask for.