This is also known as Picrosses,Nonogram,Paint by Numbers,Griddlers,Pic-a-Pix,Pixel Puzzles,Crucipixel etc.
Pic-a-Tri is Picture Logic puzzles where you need to place the block to unhide the picture on 3 directional grid. You need to determines which triangle need to painted and which need to remain empty to solve the puzzle.
Each puzzle has blank board with clue on left of every row, top right to bottom left diagonal and bottom right to top left diagonal. You need to place block by click to triangle cell to unhide hidden picture in such a way that each clue row and column black block length and sequence is corresponding to the clues and there is at least one empty square between adjacent blocks.