For the first one, the only things that may be missing are color control, proper horizontal centering and the use of the parameter, pRows, within the method. Moving on to Level 2 arrangement, without concern for colors, you just need to restrict the adding of bricks when some condition is true. With proper ordering of which loop comes first, you can control the initial value or limiting value of the inner loop by having it depend on the current value of the outer loop. For Level 3, which, like Level 2, has a condition to spawn, there is also a change in how they are placed. Level 4 is a continuation of 3 with additional control for the number of bricks in a row. All the conditions (or expressions) will be based on loop counter value(s).