diff --git a/src/main.cpp b/src/main.cpp
index 2a3f58bf07..00c2287674 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1515,83 +1515,6 @@ unsigned int static KimotoGravityWell(const CBlockIndex* pindexLast, const CBloc
     return bnNew.GetCompact();
 }
 
-unsigned int static DarkGravityWave(const CBlockIndex* pindexLast, const CBlockHeader *pblock) {
-    /* current difficulty formula, darkcoin - DarkGravity v2, written by Evan Duffield - evan@darkcoin.io */
-    const CBlockIndex *BlockLastSolved = pindexLast;
-    const CBlockIndex *BlockReading = pindexLast;
-    const CBlockHeader *BlockCreating = pblock;
-    BlockCreating = BlockCreating;
-    int64 nBlockTimeAverage = 0;
-    int64 nBlockTimeAveragePrev = 0;
-    int64 nBlockTimeCount = 0;
-    int64 nBlockTimeSum2 = 0;
-    int64 nBlockTimeCount2 = 0;
-    int64 LastBlockTime = 0;
-    int64 PastBlocksMin = 14;
-    int64 PastBlocksMax = 140;
-    int64 CountBlocks = 0;
-    CBigNum PastDifficultyAverage;
-    CBigNum PastDifficultyAveragePrev;
-
-    if (BlockLastSolved == NULL || BlockLastSolved->nHeight == 0 || BlockLastSolved->nHeight < PastBlocksMin) { return bnProofOfWorkLimit.GetCompact(); }
-        
-    for (unsigned int i = 1; BlockReading && BlockReading->nHeight > 0; i++) {
-        if (PastBlocksMax > 0 && i > PastBlocksMax) { break; }
-        CountBlocks++;
-
-        if(CountBlocks <= PastBlocksMin) {
-            if (CountBlocks == 1) { PastDifficultyAverage.SetCompact(BlockReading->nBits); }
-            else { PastDifficultyAverage = ((CBigNum().SetCompact(BlockReading->nBits) - PastDifficultyAveragePrev) / CountBlocks) + PastDifficultyAveragePrev; }
-            PastDifficultyAveragePrev = PastDifficultyAverage;
-        }
-
-        if(LastBlockTime > 0){
-            int64 Diff = (LastBlockTime - BlockReading->GetBlockTime());
-            if(nBlockTimeCount <= PastBlocksMin) {
-                nBlockTimeCount++;
-
-                if (nBlockTimeCount == 1) { nBlockTimeAverage = Diff; }
-                else { nBlockTimeAverage = ((Diff - nBlockTimeAveragePrev) / nBlockTimeCount) + nBlockTimeAveragePrev; }
-                nBlockTimeAveragePrev = nBlockTimeAverage;
-            }
-            nBlockTimeCount2++;
-            nBlockTimeSum2 += Diff;
-        }
-        LastBlockTime = BlockReading->GetBlockTime();      
-
-        if (BlockReading->pprev == NULL) { assert(BlockReading); break; }
-        BlockReading = BlockReading->pprev;
-    }
-    
-    CBigNum bnNew(PastDifficultyAverage);
-    if (nBlockTimeCount != 0 && nBlockTimeCount2 != 0) {
-            double SmartAverage = ((((long double)nBlockTimeAverage)*0.7)+(((long double)nBlockTimeSum2 / (long double)nBlockTimeCount2)*0.3));
-            if(SmartAverage < 1) SmartAverage = 1;
-            double Shift = nTargetSpacing/SmartAverage;
-
-            double fActualTimespan = ((long double)CountBlocks*(double)nTargetSpacing)/Shift;
-            double fTargetTimespan = ((long double)CountBlocks*(double)nTargetSpacing);
-
-            if (fActualTimespan < fTargetTimespan/3)
-                fActualTimespan = fTargetTimespan/3;
-            if (fActualTimespan > fTargetTimespan*3)
-                fActualTimespan = fTargetTimespan*3;
-
-            int64 nActualTimespan = fActualTimespan;
-            int64 nTargetTimespan = fTargetTimespan;
-
-            // Retarget
-            bnNew *= nActualTimespan;
-            bnNew /= nTargetTimespan;
-    }
-
-    if (bnNew > bnProofOfWorkLimit){
-        bnNew = bnProofOfWorkLimit;
-    }
-     
-    return bnNew.GetCompact();
-}
-
 unsigned int static DarkGravityWave3(const CBlockIndex* pindexLast, const CBlockHeader *pblock) {
     /* current difficulty formula, darkcoin - DarkGravity v3, written by Evan Duffield - evan@darkcoin.io */
     const CBlockIndex *BlockLastSolved = pindexLast;
@@ -1665,19 +1588,18 @@ unsigned int static GetNextWorkRequired_V2(const CBlockIndex* pindexLast, const
 unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
 {
         int DiffMode = 1;
+        
         if (fTestNet) {
-            if (pindexLast->nHeight+1 >= 16) { DiffMode = 4; }
+            if (pindexLast->nHeight+1 >= 256) DiffMode = 3;
         }
         else {
-            if (pindexLast->nHeight+1 >= 68589) { DiffMode = 4; }
-            else if (pindexLast->nHeight+1 >= 34140) { DiffMode = 3; }
-            else if (pindexLast->nHeight+1 >= 15200) { DiffMode = 2; }
+            if (pindexLast->nHeight+1 >= 34140) DiffMode = 3;
+            else if (pindexLast->nHeight+1 >= 15200) DiffMode = 2;
         }
 
         if (DiffMode == 1) { return GetNextWorkRequired_V1(pindexLast, pblock); }
         else if (DiffMode == 2) { return GetNextWorkRequired_V2(pindexLast, pblock); }
-        else if (DiffMode == 3) { return DarkGravityWave(pindexLast, pblock); }
-        else if (DiffMode == 4) { return DarkGravityWave3(pindexLast, pblock); }
+        else if (DiffMode == 3) { return DarkGravityWave3(pindexLast, pblock); }
         return DarkGravityWave3(pindexLast, pblock);
 }