No tremeble with VR

Brief descriptions and operations of this game are as follows:-
(1)This game may not be run on some devices if they lack one of the sensors used by this game. It is terribly sorry!
(2)This virtual game simulates a rolling ball on the board.
(3)Game will start if click on the screen. Similarly, clicking on the screen can stop the game during play.
(4)The smart device shall be placed flat and horizontal before starting the game.
(5)For rolling the ball, it is necessary to lean the device back forth and right left. The speed of rolling depends on the slope.
(6)Please be aware the nature phenomenon of static friction and acceleration.
(7)Each level only has a small pit but some levels have 0~4 large pits
(8)It will upgrade after ball is rolled into the small pit.
(9)To approach the small pit, the slowest speed and the smoothest way are necessary. Sound alarms after ball is rolled into the pit.
(10)This game will be terminated if the ball goes into large pits.
(11)There are 5 levels in total.
(12)The past time is shown on the left upper corner of the screen.
(13)Two spirit levels, slope of horizontal and vertical, are located in the middle upper and right of the screen, respectively.
(14)Double-clicking the screen can switch the background sound on and off. Clicking and holding a while on the screen can display the score list.