Interesting website on solving chess tactics

Interesting website on solving chess tactics - description here:  http://mortalchess.com/about

Training tactics on site emphasizes learning tactical patterns than just testing the abilities to solve puzzles. Each level is a set of 15 to 20 puzzles. Repeating to learn patterns.

Level-1	Level-54	Level-107
Level-2	Level-55	Level-108
Level-3	Level-56	Level-109
Level-4	Level-57	Level-110
Level-5	Level-58	Level-111
Level-6	Level-59	Level-112
Level-7	Level-60	Level-113
Level-8	Level-61	Level-114
Level-9	Level-62	Level-115
Level-10	Level-63	Level-116
Level-11	Level-64	Level-117
Level-12	Level-65	Level-118
Level-13	Level-66	Level-119
Level-14	Level-67	Level-120
Level-15	Level-68	Level-121
Level-16	Level-69	Level-122
Level-17	Level-70	Level-123
Level-18	Level-71	Level-124
Level-19	Level-72	Level-125
Level-20	Level-73	Level-126
Level-21	Level-74	Level-127
Level-22	Level-75	Level-128
Level-23	Level-76	Level-129
Level-24	Level-77	Level-130
Level-25	Level-78	Level-131
Level-26	Level-79	Level-132
Level-27	Level-80	Level-133
Level-28	Level-81	Level-134
Level-29	Level-82	Level-135
Level-30	Level-83	Level-136
Level-31	Level-84	Level-137
Level-32	Level-85	Level-138
Level-33	Level-86	Level-139
Level-34	Level-87	Level-140
Level-35	Level-88	Level-141
Level-36	Level-89	Level-142
Level-37	Level-90	Level-143
Level-38	Level-91	Level-144
Level-39	Level-92	Level-145
Level-40	Level-93	Level-146
Level-41	Level-94	Level-147
Level-42	Level-95	Level-148
Level-43	Level-96	Level-149
Level-44	Level-97	Level-150
Level-45	Level-98	Level-151
Level-46	Level-99	Level-152
Level-47	Level-100	Level-153
Level-48	Level-101	Level-154
Level-49	Level-102	Level-155
Level-50	Level-103	Level-156
Level-51	Level-104	Level-157
Level-52	Level-105	Level-158
Level-53	Level-106	Level-159