For those see the "out of memory" messages on firefox that causes game crash, try to hide all the floating combat texts in the option menu (in the right-top corner). It helps for me.
Tips: 1. In castle, you can heal and revive *ALL* the allies. 2. Max lv is 50. When you reach max lv for that animal, an additional *BOOST* would be given. (e.g. ac + 1) It would be much easier if you own several maximized animals. 3. Level would be increased by one if the animal survived the battle, decreased by one, otherwise. Grind the high levels by putting them at the back rows (harder to die). You can grind the levels at the starter areas with the lower level rivals. 4. Get the hard badge by finish the first 7 castles then entering the door. Finish the rest of them. Finally beat them with 4 gold dragons and 2 strikes.
For last level, you have to stack the stairs side-by-side (2 stairs) and move along the stairs and get up one step to the white hole door. Not to stack the stairs bottom-up (only 2 stairs are provided).
Get hard badge using 5 red (back lane 8 7 24/ 6 7 18/ 2 6 10) (front lane 1 10 6/ 1 10 10) 1 yellow(front lane 2 20 16). *Definitely* get a good initial enemy form (2 atk1 and 1atk2 at back lane without good abilities). *NEVER* kill the lower attack ones. Keep them alive (for blocking the positions) and only kill the higher atk / new born ones. Finally get 20 with 4 still alive.
Tip for first hard badge: 1. Get the grade 6 purple gem to remove the boss armor 2. Get the mana (7080*3)/27916, then you have three chances to kill the boss (it become easier then two chances)
No need to finish Valthiria's Victory for hard badge. You can complete any 10 of story quests. Each story quest may contain several sub-quests(I,II,...). Still fail to beat Valthiria's Victory with 4 lv 30. (2 blue, 2 orange). Get hard badge in 6y3m.
@ 11blood11 Try to reverse thinking how to form the pattern from (all lights on) to (no lights on) and you have your path from (no lights on, or any intermediate state) to (all lights on). Every button has two lights change their states from either (on to off) or (off to on).
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good tip.