Build a bridge with the given amount of materials to let the train safely cross the valley.All levels are solvable. Please try the Lite version before you buy the game!The paid version has the following advantages:⇒ no ads⇒ free build modeThe permissions are used as follows.- Write to SD card: Savegames will be stored to SD card- Internet access: Google Play services leaderboards 建立与材料的给定数量的桥梁，让火车安全地穿越山谷。所有级别都是可以解决的。请尝试精简版的版本，你买的比赛前！付费版具有以下优点：⇒无广告⇒自由构建模式权限的用途如下。 - 写入SD卡：存盘游戏将被存储到SD卡 - 互联网接入：谷歌游戏服务排行榜