Please note the following shortcuts in Penpa Interface in Sudoku Mode
Z : Normal Submode
X : Corner Submode
C : Centre Submode
V : Shading (Surface Mode)
SHIFT : For Temporary Corner Submode
SHIFT _PLUS_ DEL : Deletes only corner pencil marks from the selected cells
CTRL : For Temporary Centre Submode / Selecting Multiple Cells/ Deselecting selected cells
CTRL _PLUS_ DEL : Deletes only centre pencil marks from the selected cells
DEL : To delete all the contents of the cell
Drag the mouse pressing left click / drag your finger holding down on Mobile or Ipad for multiple cell selection
Border: ON - will allow you to write digits on the edges
I have visited your website quite often and it seems very interesting to work with you. I am a student of the Indian Institute of Information technology (IIIT), Bhagalpur. As I have seen that you have organized some events in the past Cognizance 2010, IIT Roorkee, DecaFest 2010, FMMC, Mangalore, and TechFest 2010, IIT Bombay. So it we will be very grateful if you can arrange some puzzle competitons or sudoku competitions in my college in the month of October.
Waiting for a positive reply.
Coordinator of MindTickle Club of IIIT Bhagalpur.