How can you get hidden plants (The Giant Wall-nut and Giant Sunflower)?

1: There's no Giant Sunflower in the Game.

2: The Giant Wall-nut might either be the Giant Wall-nut in Wall-nut Bowling 2 or the Tall-nut.

There are Giant Wall-nut and Giant Sunflower on a hidden minigames. It's name is Big Time. You have to use cheat engine for playing that minigame.