How to Hack Acrylic Nails!

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Acrylic Nails! is CrazyLabs’ nail salon game, past 100 million downloads on Google Play: brush on the acrylic, file it, paint it, stick flowers on it. The coins pay for the salon, the wall, the floor and the interior, a few hundred apiece and more each level. They are one number in a small JSON called progress in the playerprefs file, and the game sells no coins at all.

Acrylic Nails! Manicure done screen with 150 coins in the top right corner and 140 earned — Before: 150 coins after the first manicure

Acrylic Nails! home screen on day 1 with 999999 coins in the top right corner — After: 999999 coins

Do the first manicure. The Manicure done screen shows your coins in the top right corner; mine paid 140 and left me at 150.
Open CheatDroid, allow root and tap Acrylic Nails!. It has 27 files under Shared preferences: search for v2.playerprefs, open com.crazylabs.acrylic.nails.v2.playerprefs.xml and tap Force stop.
The playerprefs file, found by search
Search the keys for progress and tap it. In Fields, type currency into the filter, make it 999999 and tap Save.
currency 999999, was 150
Start the game. The counter next to Day 1 shows 999999.
Tap the chair button for the salon upgrades. The wall cost 90 and left 999909, and after a restart in airplane mode it was still 999909.
999909 after the 90-coin wall

What else I found

The salon upgrades get dearer: the second wall level asked 370.
Claim x2 on the results screen is a video ad. Thanks, no need takes the plain reward.
It runs offline. Tested on version 3.0.0.0.

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Made a game that keeps its coins like this? Here’s how to sign PlayerPrefs so this edit fails.