diff --git a/scripts/gui/thrive_gui.html b/scripts/gui/thrive_gui.html
index c1a2357c938..b87e0f8016f 100644
--- a/scripts/gui/thrive_gui.html
+++ b/scripts/gui/thrive_gui.html
@@ -349,33 +349,50 @@
 	      <div class="OrganelleListTitle">STRUCTURAL ORGANELLES</div>
 	      <table class="OrganelleTable"><tr>
 	          <td id="addCytoplasm" class="OrganelleListItem">
-                <div id="CytoplasmIcon"></div>Cytoplasm<br>10 MP</td>
+                <div id="CytoplasmIcon"><span class="tooltiptext">Cytoplasm <br> Cost: 10 mutation points <br> The gooey innards of a cell, they do also glycolysis.</span></div>Cytoplasm<br>10 MP</td>
           </tr></table>
 	      <div class="OrganelleListTitle">INTERNAL ORGANELLES</div>
 	      <table class="OrganelleTable"><tr>
 	          <td id="addMitochondrion" class="OrganelleListItem">
-                <div id="MitochondrionIcon"></div>Mitochondrion<br>40 MP</td>
+                <div id="MitochondrionIcon"><span class="tooltiptext">
+                Mitochondria <br> Cost: 40 mutation points <br> 
+                A captured prokaryote used by eukaryotic cells to perform respiration.<br>
+                The Mitochondria is the powerhouse of the cell</span>
+                </div>Mitochondrion<br>40 MP</td>
 	          <td id="addChloroplast" class="OrganelleListItem">
-                <div id="ChloroplastIcon"></div>Chloroplast<br>40 MP</td>
+                <div id="ChloroplastIcon"><span class="tooltiptext">
+                Chloroplast <br> Cost: 40 mutation points <br> 
+                A captured prokaryote used by eukaryotic cells to perform photosynthesis.<br>
+                The chloroplast is used primarily by plant cells on earth, but some ciliates and other organisms use it too.</span></div>Chloroplast<br>40 MP</td>
 	          <td id="addThermoplast" class="OrganelleListItem DisabledButton">
                 <div id="ThermoplastIcon"></div>Thermoplast<br>40 MP</td>
 	        </tr><tr>
 	          <td id="addVacuole" class="OrganelleListItem">
-                <div id="VacuoleIcon"></div>Vacuole<br>30 MP</td>
+                <div id="VacuoleIcon"><span class="tooltiptext">
+                Vacuole <br> Cost: 30 mutation points <br> 
+                a space or vesicle within the cytoplasm of a cell, enclosed by a membrane used to hold compounds</span></div>Vacuole<br>30 MP</td>
 	          <td id="addToxinVacuole" class="OrganelleListItem">
-                <div id="ToxinVacuoleIcon"></div>Toxin Vacuole<br>80 MP</td>
+                <div id="ToxinVacuoleIcon"><span class="tooltiptext">
+                Toxin Vacuole <br> Cost: 80 mutation points <br> 
+                Allows for production and storage of OxytoxyNT which can be shot at enemy cells</span></div>Toxin Vacuole<br>80 MP</td>
 	          <td id="addBioluminescent" class="OrganelleListItem DisabledButton">
                 <div id="BioluminescentIcon"></div>Bioluminescent Vacuole<br>N/A MP</td>
 	        </tr><tr>
 	          <td id="addChemoplast" class="OrganelleListItem">
-                <div id="ChemoplastIcon"></div>Chemoplast<br>40 MP</td>
+                <div id="ChemoplastIcon"><span class="tooltiptext">
+                Chemoplast <br> Cost: 40 mutation points <br> 
+               Allows for synthesis of hydrogen sulfide into glucose.</span></div>Chemoplast<br>40 MP</td>
               <td id="addNitrogenFixingPlastid" class="OrganelleListItem">
-                <div id="PlastidIcon"></div>Nitrogen Fixing Plastid<br>80 MP</td>
+                <div id="PlastidIcon"><span class="tooltiptext">
+                Nitrogen Fixing Plastid <br> Cost: 80 mutation points <br> 
+                Allows for synthesis of ammonia from atmospheric nitrogen.</span></div>Nitrogen Fixing Plastid<br>80 MP</td>
 	      </tr></table>
 	      <div class="OrganelleListTitle">EXTERNAL ORGANELLES</div>
 	      <table><tr>
 	          <td id="addFlagellum" class="OrganelleListItem">
-                <div id="FlagellumIcon"></div>Flagellum<br>30 MP</td>
+                <div id="FlagellumIcon"><span class="tooltiptext">
+                Flagellum <br> Cost: 30 mutation points <br> 
+                A whip like structure used microbes for movement.</span></div>Flagellum<br>30 MP</td>
 	          <td id="addPilus" class="OrganelleListItem DisabledButton">
                 <div id="PilusIcon"></div>Predatory Pilus<br>30 MP</td>
 	          <td id="addCilia" class="OrganelleListItem DisabledButton">
@@ -384,9 +401,14 @@
 	      <div class="OrganelleListTitle">PROKARYOTIC STRUCTURES</div>
 	      <table><tr>
 	          <td id="addMetabolosome" class="OrganelleListItem">
-                <div id="MetabolosomeIcon"></div>Metabolosomes<br>20 MP</td>
+                <div id="MetabolosomeIcon"><span class="tooltiptext">
+                Metabolosomes <br> Cost: 20 mutation points <br> 
+                organelle-like Bacterial microcompartments (BMCs) consisting of a protein shell that encloses enzymes used for respiration.</span></div>Metabolosomes<br>20 MP</td>
 	          <td id="addChromatophor" class="OrganelleListItem">
-                <div id="ChromatophorIcon"></div>Chromatophores<br>25 MP</td>
+                <div id="ChromatophorIcon"><span class="tooltiptext">
+                Chromatophores <br> Cost: 25 mutation points <br> 
+                Coloured, membrane-associated vesicles used by various prokaryotes perform photosynthesis.
+                Chromatophores contain bacteriochlorophyll pigments and carotenoids.</span></div>Chromatophores<br>25 MP</td>
 	      </tr></table>
 	    </div>
       </div>
diff --git a/scripts/gui/thrive_style.css b/scripts/gui/thrive_style.css
index dd7ee50f846..22aa99b0d3c 100644
--- a/scripts/gui/thrive_style.css
+++ b/scripts/gui/thrive_style.css
@@ -800,6 +800,7 @@ video {
 #generation,
 #speed,
 #size {
+  background-color: rgba(0, 139, 139, 0.3);
   position: absolute;
   height: 26px;
   margin-top: 7px;
@@ -815,15 +816,15 @@ video {
 }
 
 #generation {
-  left: 420px;
+  left: 390px;
 }
 
 #size {
-  left: 720px;
+  left: 620px;
 }
 
 #speed {
-  left: 600px;
+  left: 520px;
 }
 
 #SymmetryButton {
@@ -1067,6 +1068,28 @@ video {
   background-image: url("../../Textures/gui/bevel/CytoplasmIcon.png");
 }
 
+/* Tooltip text */
+.tooltiptext {
+  visibility: hidden;
+  width: 320px;
+  height: 30%;
+  right: 5%;
+  top: 10%;
+  font-size: 10pt;
+  background-color: rgba(0, 139, 139, 0.5);
+  color: #fff;
+  text-align: center;
+  padding: 5px 0;
+  border-radius: 6px;
+  position: fixed;
+  z-index: 1;
+}
+
+
+#CytoplasmIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #PlastidIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1076,6 +1099,10 @@ video {
   background-image: url("../../Textures/gui/bevel/NitroplastidIcon.png");
 }
 
+#PlastidIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #MitochondrionIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1085,6 +1112,10 @@ video {
   background-image: url("../../Textures/gui/bevel/MitochondrionIcon.png");
 }
 
+#MitochondrionIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #ChloroplastIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1094,6 +1125,10 @@ video {
   background-image: url("../../Textures/gui/bevel/ChloroplastIcon.png");
 }
 
+#ChloroplastIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #ThermoplastIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1103,6 +1138,10 @@ video {
   background-image: url("../../Textures/gui/bevel/ThermoplastIcon.png");
 }
 
+#ThermoplastIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #VacuoleIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1112,6 +1151,10 @@ video {
   background-image: url("../../Textures/gui/bevel/VacuoleIcon.png");
 }
 
+#VacuoleIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #ToxinVacuoleIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1121,6 +1164,10 @@ video {
   background-image: url("../../Textures/gui/bevel/ToxinVacuoleIcon.png");
 }
 
+#ToxinVacuoleIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #BioluminescentIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1139,6 +1186,10 @@ video {
   background-image: url("../../Textures/gui/bevel/ChemoplastIcon.png");
 }
 
+#ChemoplastIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #FlagellumIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1148,6 +1199,10 @@ video {
   background-image: url("../../Textures/gui/bevel/FlagellumIcon.png");
 }
 
+#FlagellumIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #MetabolosomeIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1157,6 +1212,10 @@ video {
   background-image: url("../../Textures/gui/bevel/MetabolosomeIcon.png");
 }
 
+#MetabolosomeIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #ChromatophorIcon {
   position: relative;
   left: calc(50% - 30px);
@@ -1166,6 +1225,10 @@ video {
   background-image: url("../../Textures/gui/bevel/ChromatophorIcon.png");
 }
 
+#ChromatophorIcon:hover .tooltiptext {
+  visibility: visible;
+}
+
 #PilusIcon {
   position: relative;
   left: calc(50% - 30px);