1. It is a defense game that blocks enemies with 6 kinds of colors. 2. At the time of 'random drawing', one tower of color is created randomly. 3. When strengthening, the damage is multiplied by x2, x3, x4, etc., and damage is hit. 4. The type of tower - Red: Range attack - Blue: Slow - Green: Poison - Pupple: instant death - Yellow: Summon - Gray: Speed 5. If you strengthen, the characteristics of each type will be strengthened. 6. After 100, the difficulty level will increase rapidly. If you want to rank, please follow the pattern after 100. 7. Advertising and in-app announcements - There are not many ads. To start with half of your top level at start-up, all you have to do is watch your ad, watch a very occasional ad in the middle of a game, and watch your ad to be dead. - In-app products are "Remove Ads" products, and you can benefit from the benefits of not seeing all the ads.