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In Mode 1, you have 2 BGs of 16 colors and 1 BG of 4 colors. [...]
The background priority varies depending on the setting of bit 3 of $2105.

The priority is (from 'front' to 'back'):
- BG3 tiles with priority 1 if bit 3 of $2105 is set
- Sprites with priority 3
- BG1 tiles with priority 1
- BG2 tiles with priority 1
- Sprites with priority 2
- BG1 tiles with priority 0
- BG2 tiles with priority 0
- Sprites with priority 1
- BG3 tiles with priority 1 if bit 3 of $2105 is clear
- Sprites with priority 0
- BG3 tiles with priority 0

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