While WELDER only supports portrait mode, our last update to address compatibility with iOS 8 has allowed the app switch into landscape mode-- rendering the game unplayable. We have submitted a bug fix to Apple and it should be available soon. In the meantime, to prevent the game from becoming disoriented when rotating your iPad to Landscape mode, use the device's rotation lock. If you launch the game while your device has the rotation lock turned on for landscape mode, the app will be locked into landscape mode, making it unplayable.
In order switch on and off rotation lock, swipe upwards from the bottom of the screen and and tap the lock button. If there is no lock button there, try switching the switch on the right side of your iPad. One of these steps will turn off rotation lock and allow the game to return to portrait mode.