1. control the direction key to move the front sight; click the shooting key to shoot.
2. At the beginning of each game, there will be an arithmetic above the screen. We need to figure out the number of digits of the calculation results and control the shooting of the corresponding cards by the quasi-star.
3. cards are mobile.
4. each formula has a time limit and shows in the upper right corner.
5. game is divided into three difficulties: ordinary, difficult, purgatory mode. Each mode has different degrees of difficulty.
6. There is a poker style hint before the formula: only by eliminating the corresponding pattern of cards can customs clearance, otherwise fail. There are four patterns of cards.
7. if the result is decimal, the corresponding card will be shot according to the rule of four rounds and five entries.
8. Score calculation: 500 points for simple checkpoints, 100 points for each remaining 1 s of time; 1000 points for difficult checkpoints, 150 points for each remaining 1 s of time; 1500 points for purgatory checkpoints, 200 points for each remaining 1 s of time.
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