First off, let's see some of the insane action in motion for Serious Sam Double D!
That was the first official gameplay trailer for the game. There will be some more trailers highlighting various aspects such as the GunStacker system.
With a few weeks before release, Serious Sam Double D has undergone a drastic but excellent change that heavily increases the replayability of the game.
Previously the game followed a simple structure: You battled your way from the start to the end, finding powerups and cool secrets. But if you happen to miss anything, the only real way to get it was to start from the beginning again and hope to remember where it was.
Now Sam has a Persistent Inventory system which means any gun, connector, secret, or challenge you happen to find, he gets to keep in any level. Plus, you can replay any previous level you've been!
Yes, you can take all the guns you've been collecting all along the way and head back to easier, previous levels any time you want and search for more hidden guns, secrets, or challenges tucked about.
So while initially you may have only had access to 3 guns in the first level, you can battle half way through the game, then replay the first level, now with something more like 12 guns and tons of connectors! Then you can find more weapons, then head *back* to level 7 or 8 (or wherever you were) with yet-more guns to better even the odds.
Plus we have good news that the Secrets menu is working great. You can look any time you want at secrets you've unlocked and revisit the funnier ones, or just use it to know how many are still to be found. And because the inventory is persistent, you can simply play from whatever secret you visit and any more powerups you find will be added to your inventory for access in later levels or your current one.
And one extra helper is the Treasure icon. It definitely doesn't make it too easy, but it does fade in slowly if you're getting warm when finding a secret.