Based on the game created by https://github.com/christianp/30secondchallenge.
Added some features and translated into german.
You can turn off the timer, and the infinity time limit will not start a timer.
Added some CSS for printing, now 3 challenges will fit on an A4 sheet, the answers will be empty, all unneccessary stuff will be hidden. Now you can printout some hardcopy challenges.
Licence
Copyright 2015 Christian Lawson-Perfect
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.