as shown in fig3 and 4 row leveling tool assembly 200 includes bracing members 220 and 240 which are mounted to blocks 15 in contiguous rows and hook members 280 and 290 that are removably mounted to cavities 80 and 90 row leveling tool assembly 200 also includes support member 250 and a straight elongated rigid members 260 with cooperative dimensions to be received by bracing members 220 and 240 in this manner blocks 15 in contiguous rows and those in between are kept in alignment as seen in fig5 a and 5 b straight elongated rigid member 260 includes a plurality of openings 262 that receive fastening members 264 therethrough additionally bracing members 220 and 240 includes l shaped openings 222 and 242 to cooperatively and slidably receive fastening members 264 mounted straight elongated rigid member 260 as best seen in fig4 a once a user mounts straight elongated rigid member 260 to bracing members 220 and or 240 he she aligns it with tool assembly 200 by adjusting fastening members 264 block 315 is intended to be used in rows other than the base first laid row block 315 has substantially the same shape and dimensions of block 15 as shown in fig6 7 and 8 with longitudinal walls 320 and 340 and transversal walls 330 350 and 370 defining internal cavities 380 between walls 330 and 350 and 390 between walls.