Update/Clarification on Penpa Interface

Please note the following update / clarifications on Penpa Interface
Based on requests from players

• We have increased the size of "Submit" Button
• We have introduced shortcut key "Alt _PLUS_ S" for submitting

Also, would like to clarify that the solution can be in any color. Single digits in center mode are also valid.
Here is an example of valid solution for Trial 1 puzzle