I hate that game cuz its so dull! I don't have the patience for it and I keep drawing lines willy nilly anybody else have this problem? I can usually make it to level 14! =(
I also find the game really boring. I finished four of the stamps, but I'm leaving the last one. And drawing straight lines was an issue for me, but I found a solution. Here's my probably really hard to follow explanation:
Try using two styluses. Hold one in each hand. Place the first stylus on the pencil to start, then place the second stylus on the spot that you want to go to. Raise the first stylus. You can now place the first stylus where you want to go next. Repeat. You can “walk” along the path that you want to follow.
I'm not great at explaining this... Try doing it as you read. That might make more sense. I could try to explain something in more depth if necessary. The gamepad uses the center of where pressure is applied as where you touched. So if you press on two corners of the screen, it will count the area halfway between the two spots where you are pressing on the screen.
For warp gate info, you might want to look here: http://www.gamefaqs.com/boards/673043-nintendo-land/64947779
The warp gates save a lot of time. If you want stamp number 4, try saving the shortest route for the extra stages. Each warp will only appear once each time you play. So if you use the warp on the normal stage 3, it won't appear on the extra stage 3.