Gene Modification is a feature in the Chinese version of Plants vs. Zombies 2. On December 2nd, PopCap Shanghai showed the new way to get Puzzle Pieces - Gene Modification. It was released with the v1.9.1 update in Android, and v2.0.0 in iOS.
The player can put 2~5 puzzle pieces in to the interface shown below, and spend 5000 coins (or 20 gems: which increases the chance to create a puzzle piece with higher rarity) to create a new puzzle piece. The plant of the new puzzle piece is uncertain, but the rarity is shown above the "Create" button.
Results of Creation
- 2 puzzle pieces (same rarity) will create a puzzle piece with a plant with the same rarity. For example, 2 Electric Blueberry Puzzle Pieces may create a Coconut Cannon Puzzle Piece, but will not create a Snapdragon Puzzle Piece or a Laser Bean Puzzle Piece.
- 3 puzzle pieces (same rarity) will have a 50% chance to create a puzzle piece with a plant of higher rarity.(And the other 50% will create a puzzle piece with another plant of the same rarity)
- 4 puzzle pieces (same rarity) will have a higher chance of creating a puzzle piece with a plant of higher rarity(67%)
- 5 puzzle pieces (same rarity) will create a puzzle piece with a plant of higher rarity. (Example 1: 5 Horsebean Puzzle Pieces will may create a Cattail Puzzle Piece; Example 2: 5 Peashooter Puzzle Pieces may create a Sap-fling Puzzle Piece but also has a chance to create Spore-shroom Puzzle Piece)
Note is that although this might be the only way to get Legendary-rarity puzzle pieces and to make use of the unused puzzle pieces (such as Gold Leaf), this function is very coin consuming.
Try to still buy high rarity plants Puzzle Pieces in the PvP Store in the PvP Mode even if you don't need it. Through Gene Modification, those Puzzle Pieces can be exchanged for a high rarity Puzzle Pieces that you may want. For example, if you already have a level 4 Acid Lemon, still buy his Puzzle Pieces if you see them in the store, because 2 of them can already change to another kind of plant's that you might want.