There are several ways to get bills in the game:

1. Complete quests

2. Receive daily bonus

3. Spin the fortune wheel after completing a puzzle

4. Purchase them in the in-app Shop

5. Subscribe to the game

To access the quests, tap "Quests" at the bottom left corner.

Here are the ways you can use bills:

1. Buy special furniture or decorations which require bills instead of coins. These items have green icons and bill icons next to their prices.

2. Buy furniture or decorations with ad labels instantly and skip the ads.

3. Buy energy from the Energy Shop.

4. Buy boosters if you run out of them.

5. Get access to paid puzzles which are marked with a bill label.