Bokujou Monogatari: Mineral Town no Nakama Tachi

When you're going to buy a Curry Powder in the store, it says it's 100G, but it's actually 50G only!

On Mondays, Wednesdays, and Rainy Days between 1 and 4 PM, Carter will be in the upper-left room and is able to remove cursed tools and accept confessionals. You are given one chance to confess to something. If he forgives you, then you will be encouraged to move on and something will happen. If you are not forgiven, you are merely scolded and nothing else happens. The confessions not mentioned have little or no effect.

There is a place where you can get truffles for free behind the church, through the locked door on the right. All you got to do to access it is to be friends with Carter, give him mushrooms once a day for a season or so. During fall, go to the church, if you are good enough friends, carter wont be there and then you would go to the door and find its unlocked, after a short scene, you can pick Truffles and Mushrooms anytime you like! Truffles are worth a lot, take advantage of this plantation

Starting with Year 5, then every 5 years after that (eg: Y5, Y10, Y15, etc.) visit the Peak of Mother's Hill on Fall 10 between 6PM and midnight to activate a serect event called the Shooting Star Event. Make the wish to double profits (option 3). The day will end. You then have until 5PM to ship as many things as you can. When Zack comes, he'll double your profits for Fall 11.
NOTE: Fall 10 MUST be sunny, or the event won't activate.

There are extra kinds of seeds which you can unlock by shipping other produce. Simply ship a total of 100 of each of certain produce to unlock them.