Puzzle to the Center of Earth Hack 1.0.4 + Redeem Codes

I love this game. It's fun and challenging. It gets much harder as you progress. I never cared for mining gold coins in the early levels but in the later levels I was needing gold. I refuse to pay .99 cents for everything I need so the only way to progress through later levels is to have lots of gold on hand to buy helpful things. After I got stuck at level 25 and my gold supply was dwindling, I realized the need to have mined as much gold as possible in the early levels. Once you complete a level finding both the switch and the gold star, you can no longer mine for gold on this levels. If you don't open the gold star chest on one of the easy levels, you can go back time and time again and mine for easy gold. I left level 4 open just for that reason.

I really enjoy the cave exploration/miner genre of games. I like the "chain similar items" but it can get repetitive. Combine the two genres and you have one of the most amazing games I've ever played on iOS. The graphics are top notch and the music is perfect. The gameplay is challenging and there are plenty of strategies which make you think through your choices as you continue to dig deeper. The tutorials are very well done. The most amazing part is that the game is completely free. The IAP is totally optional and completely not needed. You also aren't harassed about IAP. You wouldn't even know it's there unless you look for it. If you want to make your game a little easier by adding a map then you can pay 99 cents. You can pay $4.99 if you want to get rid of the recharge to play timers. These developers deserve your money and I'm going to buy some IAP because THIS is how you make a freemium game!! EDIT: I've removed a star because it won't stop harassing me about a review even after I've written one.

and, unlike some people who clearly lack the skills required to progress, I have found ZERO requirement to purchase anything to progress. I did purchase the unlimited lives, not because i had to to progress but because I love this game and want to support the developers.

i do agree more hearts or the ability to match or find blocks to heal would be GREAT, but isnt necessary as you can just AVOID the creatures! takes skill, patience, and planning but is how I made it all the way to the end of what's currently available - which btw, PLEASE MORE LEVELS!!!
this game gets hard as you progress, but that just makes it more fun. if the challenge level stayed the same, it would get boring! this is more than a matching game, it's a strategy, puzzle, adventure game and is AWESOME.

This game is one of my favorites. The design is superb, the graphics are great, the challenge is there... what more can you ask for in a freemium game? You can even get through the entire game without spending any money, which is an amazing thing. Paying for the unlimited lives is worth it just to give the developers some appreciation.

The ONLY complaint is that they have never continued the game beyond level 80. Still, the 80 levels are enough to keep you busy.

Highly recommend. This is one of my must-have games and I hope they continue to upgrade as necessary when the operating system upgrades.

Great unique concept, especially for those of us who don't want to have to be fighting enemies at every turn. As far as I can tell, bugs are fixed quickly. Spending money has not been a necessity (level 9 mentioned in other comments was a bug and was fixed soon after I reached that level) for playing the game. The only downside for me is that the levels can be rather long, which means I tend not to choose to play this game if I don't have much time. Being able to Save the game and finish the level later would be helpful, although I would prefer simply having shorter levels. I just started on the timed levels and am not too keen on that idea. Overall, great game that I continue to enjoy playing.

there are many things I love which led to my four star rating, though if the following was ever updated in a patch I would quickly upgrade my review to five stars:

-please add more one liners because "nobody said this would be easy" gets old fast.
-update the three other characters so each has unique strengths. It makes no sense that the robot would need to breathe when underwater (???), while the heroine might be able to jump higher.
-in later levels enemies take away two bars of health(!). this makes even the armor upgrade worthless because that only ups your health to four which is not enough; three or four, you still die after just 2 hits! Patch this, please (I said please!)
-you should be able to permanently upgrade your health bar.
-more combos! How about a combo for restoring one bar of health (not to beat a dead horse; such a limited health bar is a major buzzkill in this game)

While this is a long list I really love this game and I hope the question mark area is a hint at many levels to come (I am currently at level 67 with I am guessing just over a dozen levels left!)

This game is amazing. Out the hundreds of app games I have had over the years, this is probably in my top two because of its creativity and progressively difficult gameplay. I have to give it four stars because I have been waiting for more than a year for an update with new levels that are promised after you beat the game, but have not been added. Please add the levels soon! People have left for war and come back again in the time it is taking to update this app.

This was for the last few weeks the game I most enjoyed playing. The new update has changed things. It eliminated the ability to go back and play levels with chests continuously to get enough money/maps to actually progress. Level 50 is basically impossible with the blocks falling on you, lack of energy available, number of colors, exploding radiation blocks and to top it all off a 5 minute time limit. Not like you need that anyway. Can't live long enough to run out of time. Was the best game but now I can't see myself continuing. Especially if I have to play the early levels 100 times to get enough money for a hard hat and armor that withstand being hit 1 time.

Best game I have played on my phone. Totally addicting. Very challenging and of course frustrating. Seriously thought some levels were impossible to get through. But I completed the game. Now what. I got level 80. Is there plans for more?!?!?!

Confused about those saying you have to pay to keep going through the more challenging parts. I did not spend any money on this game. I just kept trying. Some levels are ridiculously hard, but it is definitely possible.

I'm revising my review to AVOID. Up until around level 38 you can play without spending $. Level 50 is impossible whether you spend $ or not.

Problem is that up until around level 38 the game is one of the best available which makes you more vulnerable to spend $. However, they totally ruined the game by making the levels too impossible... Especially level 50. You could spend $20 and still not make it through level 50. Rediculous!!! So best advice is avoid the game completely.

Elmo8842: go thru maze on right. Flip switch, do maze, get star, retrace steps, open door, enter next room. Now instead of falling down the path, jump up and into maze with switch.