Number Logic Puzzle 1485

Type: Killer, Rectangular Blocks
Size: 4
Points: 16, Penalty:0, Time : Initializing..  
12
34
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Rules:

The grid is covered by cages (groups of cells), marked with dotted outlines. Each cage encloses 2 or more cells. The top-left cell is labeled with a cage sum, which is the sum of all solution digits for the cells inside the cage. All digits in a cage should be distinct.
The goal is to fill the grid with digits so that no digit appears more than once in any row, column, or cage.

This puzzle has Rectangular Blocks. Every block contains each of the digits only once.