I'd suggest unlocking rune levels after each boss fight. For example, levels 1-7 available until the first boss fight, levels 1-13 available until the second boss fight, levels 1-20 available until the last boss and levels 1-25 after beating the game or something along those lines.
I have been getting reports on this strange bug. It needs not to be exact. May you please update your flash player and see it the problem persists? thank you for reporting.
Having an issue with Stage 16: Even though I have no outfits with the "Remove Obstacles..." ability, the blocks are still showing, so I cannot reach the lower levelto get the Dragonball characters or the last chest.
CBR77's suggestion worked for me. In Chrome, type "chrome://plugins" in the address bar to access plugin settings. On the right, click DETAILS to expand the windows. Under Flash plug-ins, locate pepflashplayer.dll and click DISABLE. This fixed the black screen problem for me and allowed me to reach level 2. My flash screen was also shaking before I disabled this and that has stopped as well.
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Good suggestions. I'll take not of this for future games / updates. Thanks!